diff --git a/rpkm67/backend/group/v1/group.proto b/rpkm67/backend/group/v1/group.proto
new file mode 100644
index 0000000..ccbc218
--- /dev/null
+++ b/rpkm67/backend/group/v1/group.proto
@@ -0,0 +1,101 @@
+syntax = "proto3";
+
+package rpkm67.backend.group.v1;
+
+import "rpkm67/backend/baan/v1/baan.proto";
+
+option go_package = "rpkm67/backend/group/v1";
+
+service GroupService {
+  rpc FindOne(FindOneGroupRequest) returns (FindOneGroupResponse) {}
+  rpc FindByToken(FindByTokenGroupRequest) returns (FindByTokenGroupResponse) {}
+  rpc Update(UpdateGroupRequest) returns (UpdateGroupResponse) {}
+  rpc Join(JoinGroupRequest) returns (JoinGroupResponse) {}
+  rpc DeleteMember(DeleteMemberGroupRequest) returns (DeleteMemberGroupResponse){}
+  rpc Leave(LeaveGroupRequest) returns (LeaveGroupResponse){}
+  rpc SelectBaan(SelectBaanRequest) returns (SelectBaanResponse) {}
+}
+
+message Group{
+  string id = 1;
+  string leaderID = 2;
+  string token = 3;
+  repeated UserInfo members = 4;
+  repeated rpkm67.backend.baan.v1.BaanInfo baans = 5;
+}
+
+message UserInfo {
+  string id = 1;
+  string firstname = 2;
+  string lastname = 3;
+  string imageUrl = 4;
+}
+
+//Find One
+message FindOneGroupRequest{
+  string userId = 1;
+}
+
+message FindOneGroupResponse{
+  Group group = 1;
+}
+
+// Find By Token
+message FindByTokenGroupRequest{
+  string token = 1;
+}
+
+message FindByTokenGroupResponse{
+  string id = 1;
+  string token = 2;
+  UserInfo leader = 3;
+}
+
+// Update
+message UpdateGroupRequest{
+  Group group = 1;
+  string leaderId = 2;
+}
+
+message UpdateGroupResponse{
+  Group group = 1;
+}
+
+//Join
+message JoinGroupRequest{
+  string token = 1;
+  string userId = 2;
+}
+
+message JoinGroupResponse{
+  Group group = 1;
+}
+
+// Delete
+message DeleteMemberGroupRequest{
+  string userId = 1;
+  string leaderId = 2;
+}
+
+message DeleteMemberGroupResponse{
+  Group group = 1;
+}
+
+// Leave
+message LeaveGroupRequest{
+  string userId = 1;
+}
+
+message LeaveGroupResponse{
+  Group group = 1;
+}
+
+// Select Baan
+message SelectBaanRequest{
+  string userId = 1;
+  repeated string baans = 2;
+}
+
+message SelectBaanResponse{
+  bool success = 1;
+}
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