The invention provides a picture printing device. Though the device adopts a structure which smoothly guides a developed picture to a colorimeter from an output part, maintaining performance of a processing groove is still good. The picture printing device is provided with a development processing part, an output conveying part and a colorimeter (20) which tests the photosensitive material for printing output by the output conveying part. The device is also provided with an upper cover (10) which can switch poses between an open pose of opening the upside of the development processing part and a close pose of closing the upside of the development processing part. The colorimeter is disposed on the upper surface of the upper cover by a mobile mechanism (30) so as to move between a first place connected with the output conveying part and a second place disconnected with the output conveying part.