Diagnostic device of passenger conveying equipment and passenger conveying equipment

A diagnostic device for passenger conveying equipment according to the present invention comprises: a drive unit end gear rotating synchronously with a drive motor; an endless stair chain that secures a plurality of stair; and a driven unit end gear which rotates synchronously with the drive unit end gear and changes the position relative to the drive unit end gear in accordance with the extension of the stair chain. The diagnostic device further includes adisplacement detector detecting the displacement of the drive unit end gear from the reference position; amoving distance detector for detecting a moving distance of the plurality of stairs; a stair passing detector configured along the periodic rotation track of the plurality of stairs to detect the passing of at least any stair of the plurality of stairs; a data acquisition unit that starts displacement measurement of the driven unit end gear detected by the displacement detector with respect to the movement distance of the stair detected by the movement