A combination type mouse includes a supporting plate, a lower cover plate, a main circuit board, plural main connectors, an input module and a control module. The main circuit board is installed on an installation surface of the supporting plate. The plural main connectors are installed on the main circuit board and electrically connected with the main circuit board. The input module includes a first connector and a connecting recess. The first connector is electrically connected with a first main connector of the plural main connectors. The control module includes a second connector and a connecting part. The second connector is electrically connected with a second main connector of the plural main connectors. The connecting part is engaged with the connecting recess. Consequently, the components of the combination type mouse to be assembled can be determined according to the user's requirement.