An electronic circuit component mounter, including: a substrate holding device to hold a circuit substrate; a component supply device (23, 24) to supply electronic circuit components; a mounting device, including (a) a component holding tool, (b) a movable member to hold that component holding tool, and (c) a moving device to move at least that movable member relative to the substrate holding device; and a control device to control the mounting device so that electronic circuit components are received by the component holding tool from the component supply device (23, 24) and mounted on the circuit substrate held by the substrate holding device, wherein the component supply device (23, 24) includes a moving type component supply device which is held on the movable member and moved together with the component holding tool by the moving device and supplies electronic circuit components to that component holding tool, characterized in that the moving type component supply device is equipped with a detachable section that includes at least a component storage section which stores multiple electronic circuit components and that is detachable with a movable member side section (142, 160) which is a section on the movable member side, and wherein the electronic circuit component mounter includes at least one of: a detachable section presence judging section which judges whether that detachable section is attached to the movable member side section (142, 160); and a detachable section required judging section which judges whether it is required to attach that detachable section to the movable member side section (142, 160). a substrate holding device to hold a circuit substrate; a component supply device (23, 24) to supply electronic circuit components; a mounting device, including (a) a component holding tool, (b) a movable member to hold that component holding tool, and (c) a moving device to move at least that movable member relative to the substrate holding device; and a control device to control the mounting device so that electronic circuit components are received by the component holding tool from the component supply device (23, 24) and mounted on the circuit substrate held by the substrate holding device, wherein the component supply device (23, 24) includes a moving type component supply device which is held on the movable member and moved together with the component holding tool by the moving device and supplies electronic circuit components to that component holding tool, characterized in that the moving type component supply device is equipped with a detachable section that includes at least a component storage section which stores multiple electronic circuit components and that is detachable with a movable member side section (142, 160) which is a section on the movable member side, and wherein the electronic circuit component mounter includes at least one of: a detachable section presence judging section which judges whether that detachable section is attached to the movable member side section (142, 160); and a detachable section required judging section which judges whether it is required to attach that detachable section to the movable member side section (142, 160).