Component mounting device and detection device

A component mounting device including: a nozzle (801) for conveying components; a detection device (100) that outputs pulse-type first signals that signal the landing of components; and a processing unit (1305). The detection device (100) has a piezoelectric body (105). The processing unit (1305) obtains at least either information about the degree of deceleration by the nozzle (801) or information about a stop position, on the basis of the first signal output from the detection device (100).