A component mounter mounting head holding device for detachably holding a mounting head to a head holding section of a component mounter, including: a pin to be engaged provided on a connection section for a head holding section of the mounting head; an engaging member provided on the head holding section that moves between an engagement position for holding the mounting head in which the engaging member is engaged with the pin and a release position in which the engaging member is separated from the pin; and an air cylinder provided on the head holding section that is a power source for moving the engaging member between the engagement position and the release position. When attaching/detaching the mounting head to/from the head holding section, the head holding section is rotated to a position in which the engaging member can pass by the side of the pin.
