To provide a spacer mounting method using a spacer holding part for easily holding a spacer without causing misalignment thereof.

In the spacer mounting method, (A) the spacer 40 is held at its lower end by the spacer holding part provided on a first panel, and then (B) the first panel AP and a correcting tool 150 are relatively moved when an upper end 43 of the spacer 40 contacts the correcting tool 150 for correcting the position of the upper end 43 of the spacer 40 in a second direction perpendicular to a first direction so that the spacer 40 is arranged at a right angle to the first panel AP.