diff --git a/messages/en-US/msgs.json b/messages/en-US/msgs.json
index 23f4878..fa217c0 100644
--- a/messages/en-US/msgs.json
+++ b/messages/en-US/msgs.json
@@ -5,6 +5,7 @@
     "user invalid syntax": "Invalid syntax in one of user's parameters!",
     "user already in group": "User is already in group!",
     "user not found": "User does not exists!",
+    "admin leave": "You are an admin of that group. You must transfer ownership of that group first!",
     "username taken": "Username is taken!",
     "username not found": "Such username not found!",
     "username required": "Username is required!",
diff --git a/messages/ru-RU/msgs.json b/messages/ru-RU/msgs.json
index 54494b2..ab852ba 100644
--- a/messages/ru-RU/msgs.json
+++ b/messages/ru-RU/msgs.json
@@ -5,6 +5,7 @@
     "user invalid syntax": "Неправильный синткасис в одном из параметров пользователя!",
     "user already in group": "Пользователь уже в группе!",
     "user not found": "Пользователь не существует!",
+    "admin leave": "Вы являетесь администратором группы. Перед выходом передайте владение группой!",
     "username taken": "Имя пользователя занято!",
     "username not found": "Такое имя пользователя не найдено!",
     "username required": "Требуется имя пользователя!",
diff --git a/src/controllers/group.js b/src/controllers/group.js
index 30300f0..3aba1df 100644
--- a/src/controllers/group.js
+++ b/src/controllers/group.js
@@ -16,10 +16,7 @@ class GroupController {
         let user = jwt.decode(req.headers.authorization.split(' ')[1], config.secret);
         let group = await GroupService.create(groupName, user.login.id);
 
-        log.info(`New group with name ${groupName} was just created by user ${user.login.username}`);
-
         await UserService.joinGroup(user.login.id, group.id);
-        // return res.status(200).send(translate(req.headers["accept-language"], responseCodes.responses.general.ok));
         return res.status(200).send(group.id.toString())
     }
     async join(req, res) {
@@ -28,7 +25,21 @@ class GroupController {
         let user = jwt.decode(req.headers.authorization.split(' ')[1], config.secret);
         await UserService.joinGroup(user.login.id, groupId);
 
-        log.info(`User ${user.login.username} has just joined group with ID ${groupId}`);
+        return res.status(200).send(translate(req.headers["accept-language"], responseCodes.responses.general.ok));
+    }
+
+    async leave(req, res) {
+        let groupId = req.params.groupId;
+
+        let user = jwt.decode(req.headers.authorization.split(' ')[1], config.secret);
+
+        if (await GroupService.getAdminId(groupId) == user.login.id) {
+            let code = responseCodes.responses.user.admin_leave
+            return res.status(responseCodes.getHTTPCode(code)).send(translate(req.headers["accept-language"], code))
+        }
+
+        await UserService.leaveGroup(user.login.id, groupId);
+
         return res.status(200).send(translate(req.headers["accept-language"], responseCodes.responses.general.ok));
     }
 
diff --git a/src/response/responseCodes.js b/src/response/responseCodes.js
index 7600b2c..380abba 100644
--- a/src/response/responseCodes.js
+++ b/src/response/responseCodes.js
@@ -7,7 +7,8 @@ const responses = {
         duplicate: "user duplicate",
         invalid_syntax: "user invalid syntax",
         already_in_group: "user already in group",
-        not_found: "user not found"
+        not_found: "user not found",
+        admin_leave: "admin leave"
     },
     usernames: {
         duplicate: "username taken",
@@ -119,6 +120,8 @@ const getHTTPCode = (type) => {
             return 400
         case responses.user.not_found:
             return 404
+        case responses.user.admin_leave:
+            return 409
 
 
         case responses.usernames.duplicate:
diff --git a/src/routers/group.js b/src/routers/group.js
index ff3c29c..67dea72 100644
--- a/src/routers/group.js
+++ b/src/routers/group.js
@@ -8,6 +8,7 @@ const GroupRouter = new Router();
 
 GroupRouter.post('/create/:groupName', tryHandler(auth.authenticate), tryHandler(GroupController.create));
 GroupRouter.post('/join/:groupId', tryHandler(auth.authenticate), tryHandler(existance.groupExists), tryHandler(auth.requirePassword), tryHandler(auth.checkGroupPassword), tryHandler(GroupController.join));
+GroupRouter.get('/leave/:groupId', tryHandler(auth.authenticate), tryHandler(existance.groupExists), tryHandler(auth.userIsInGroup), tryHandler(GroupController.leave));
 GroupRouter.post('/password/:groupId', tryHandler(auth.authenticate), tryHandler(existance.groupExists), tryHandler(auth.authorizeGroupOwner), tryHandler(auth.requirePassword), tryHandler(GroupController.updatePassword));
 GroupRouter.get('/byName/:groupName', tryHandler(auth.authenticate), tryHandler(existance.groupNameExists), tryHandler(GroupController.getByName));
 GroupRouter.get('/byId/:groupId', tryHandler(auth.authenticate), tryHandler(existance.groupExists), tryHandler(auth.userIsInGroup), tryHandler(GroupController.getById));
diff --git a/src/services/user.js b/src/services/user.js
index af2be6d..e899b4e 100644
--- a/src/services/user.js
+++ b/src/services/user.js
@@ -31,7 +31,11 @@ class UserService {
 
     async joinGroup(userId, groupId) {
         if (await (this.isInGroup(userId, groupId))) throw new customError(`joinGroup user already in group`, responseCodes.responses.user.already_in_group);
-        await db.query("UPDATE Users SET groups = array_append(groups, $1::integer) WHERE ID = $2", [groupId, userId]);
+        await db.query("UPDATE users SET groups = array_append(groups, $1::integer) WHERE ID = $2", [groupId, userId]);
+    }
+
+    async leaveGroup(userId, groupId) {
+        await db.query("UPDATE users SET groups = array_remove(groups, $1::integer) WHERE ID = $2", [groupId, userId]);
     }
 
     async changeUsername(userId, username) {