To determine the intensity of the rigidity of a member to be printed with better sensitivity by a simpler structure.

The printing apparatus includes a detection unit 11 that detects types of materials of the printed member P that is conveyed. The detection unit includes a detection lever 47 that sways at a predetermined angle with respect to a sway fulcrum 45 and a sensor 55 that detects the angle change of the detection lever. The detection lever includes a lower long piece 49 that extends downward from the sway fulcrum, contacts with the printed member and makes the detection lever generate the swaying and an upper long piece 50 that extends upward of the sway fulcrum and where the end crosses a detection region of the sensor by the swaying.