An integrated circuit load board includes a substrate on which a plurality of integrated circuit sockets and an integrated test circuit are mounted. The at least two cameras acquire images of the touch surface from different locations and have overlapping fields of view. The apparatus performs printing operation on a printing medium by discharging ink while reciprocally moving the carriage, on which the above inkjet printhead is mounted, in a direction in which the plurality of nozzle arrays are arranged. Accordingly, even if the second switch board 12 receives an impact from the hammer member 3 when the hammer member 3 turns ON the second switch 5, the impact is not easily transmitted to the first switch 4. The oil supply hole may be positioned under the opening of the passage, or may be provided between a lower edge of the opening of the passage and a piston ring of the piston, when the piston is located at a bottom dead center.