To provide a circuit parts in which even a protruding part of a cabinet in which an outer connection terminal is constituted is included in a heat-shrinkable insulating pipe and in which insulation characteristics can be improved.

A motor protector 100a which is the circuit parts is installed on an electric current passage to supply the electric current to a motor which is a control object, controls supply of the electric current to the motor, and has the protruding part 143-1 constituted in a side face of a base 140a, the outer part connection terminal 144-1 constituted of the protruding part 143-1 and electrically connected to an arm 120 constituting a circuit in the base 140a, a conductive wire 152-1 of which the tip is connected to the outer connection terminal 144-1, and the heat shrinkable insulating pipe 160-1 which includes a connection part of the outer connection terminal 144-1 and the conductive wire 152-1.