To provide a correcting method for positioning a nozzle more accurately.

An electronic part mounting device 100 comprises a base 104, a head 110 provided with a chucking nozzle 111, an X-axis guide 121 for guiding the head along an X-axis direction, a Y-axis guide 122 for guiding the X-axis guide 121 along a Y-axis direction, a mark display part 130 for displaying a plurality of recognition marks M1 to Mn, and first and second cameras 112, 113 provided on the head. The method for correcting a nozzle position of the electronic part mounting device 100 comprises an imaging step of imaging each recognition mark by the two cameras; an offset acquiring step of acquiring an offset of an imaging position for each camera; a Y-axis offset specifying step of calculating an offset in the Y-axis direction of the nozzle from a Y-axis directional imaging position offset on the two recognition marks imaged by the two cameras, respectively, and from a relative positional relationship between each camera and the nozzle; and a positioning step of correcting the calculated offset to position the nozzle.