A component feeder which includes a feeding mechanism which is configured to feed taped components in which components (p) with leads (Le) having a plurality of leads (Le) are held on a carrier tape by the plurality of leads (Le) at a predetermined disposition pitch, at a predetermined feeding pitch, and which is configured to consecutively supply one component (p) at a predetermined supply position, the component feeder comprising: a positioning mechanism which is configured to position each of the plurality of leads (Le) included in the component (p) at the supply position, wherein the positioning mechanism includes a clamp which is configured to include a first member and a second member that are operated relative to each other, and is configured to perform an opening and closing action, and which is configured to pinch the plurality of leads (Le) by a pinching section (134, 136) provided in each of the first member and the second member in a closed state, and a guide section which is provided in one of the first member and the second member, and is configured to guide each of the plurality of leads (Le) to a defined position in a feeding direction of the taped component (p) when the plurality of leads (Le) are pinched by the clamp, and wherein the component feeder includes a clamp closed position checking mechanism for checking whether or not a closed position which is an operation position of the clamp, in a state where the clamp is closed, is an appropriate position, and characterized in that the clamp closed position checking mechanism is configured to include a detection target section provided in the guide section and a sensor which regards the detection target section as a target of detection, and to be capable of detecting whether or not the closed position of the clamp is the appropriate position depending on the presence or absence of the detection of the detection target section by the sensor. a positioning mechanism which is configured to position each of the plurality of leads (Le) included in the component (p) at the supply position, wherein the positioning mechanism includes a clamp which is configured to include a first member and a second member that are operated relative to each other, and is configured to perform an opening and closing action, and which is configured to pinch the plurality of leads (Le) by a pinching section (134, 136) provided in each of the first member and the second member in a closed state, and a guide section which is provided in one of the first member and the second member, and is configured to guide each of the plurality of leads (Le) to a defined position in a feeding direction of the taped component (p) when the plurality of leads (Le) are pinched by the clamp, and wherein the component feeder includes a clamp closed position checking mechanism for checking whether or not a closed position which is an operation position of the clamp, in a state where the clamp is closed, is an appropriate position, and characterized in that the clamp closed position checking mechanism is configured to include a detection target section provided in the guide section and a sensor which regards the detection target section as a target of detection, and to be capable of detecting whether or not the closed position of the clamp is the appropriate position depending on the presence or absence of the detection of the detection target section by the sensor.