A connecting member in a radio control transmitter for transmitting a control signal to a control target by controlling an operating portion detachably attached to a main body is provided. The connecting member is disposed between the main body and the operating portion to randomly set a position of the operating portion with respect to the main body, wherein the connecting member has outer fitting holes arranged along a circumference of a large diameter and inner fitting holes arranged along a circumference of a small diameter to be concentric with arrangement of the outer fitting holes.