To provide a projection type display device capable of easily adjusting distortion of an image projected on a surface to be projected.

A projector 1 comprises: a lamp 201; liquid crystal panels 203, 204 and 205 that modulate light from the lamp 201 according to an image signal; and a signal processing circuit 507 that generates an image signal for forming a first adjustment image in which a distortion adjustment pattern for image distortion adjustment consisting of a predetermined diagram is superposed on an image corresponding to an image signal from the outside.