A component supply device includes a plurality of kinds of tape feeders capable of mounting a first component storing tape by which supplying of components is performed precedingly, and a second component storing tape by which supplying of components is performed succeedingly; a component sensor configured to detect runout of the components in the first component storing tape; and a control unit configured to control a tape feeding operation. A specified discharge length by which the first component storing tape is discharged at the time of occurrence of the runout of the components is preliminarily set for each kind of the tape feeder. The control unit is configured to make the tape feeder perform a tape feeding operation for feeding the first component storing tape by the specified discharge length when the component sensor detects the runout of the components in the first component storing tape.