The present invention is provided with: a first substrate (1) which is a printed circuit substrate having an electronic circuit component mounted thereto; a second substrate (2) which is a printed circuit substrate having an electronic circuit component mounted thereto; an inter-substrate connector (3) which has a first terminal (31) disposed on the first substrate and a second terminal (32) disposed on the second substrate and connected to the first terminal, and which electrically connects between the first and second substrates; and a gripper (4) disposed on the second substrate.