Circuit board module

A circuit board module that is electrically connectable to a socket by inserting one end part thereof into the socket, and extractable from the socket, the circuit board module comprising:

• a circuit board having a surface mounted with an electronic component;
• and
• a terminal board having a first surface provided with a column of socket-connection pads, and mounted on the surface of the circuit board at the one end part,
• wherein the terminal board includes a first pad column, a second pad column, and a third pad column respectively provided on a second surface of the terminal board opposite to the first surface,
• wherein the first pad column includes a plurality of first pads arranged at predetermined intervals in a first direction, the second pad column includes a plurality of second pads, equal to a number of first pads, arranged at the predetermined intervals in the first direction, and the third pad column includes a plurality of third pads, equal to the number of first pads, arranged at the predetermined intervals in the first direction,
• wherein the second pad column and the third pad column are arranged on both sides of the first pad column along a second direction perpendicular to the first direction, separated from the first pad column, to be line symmetrical to a centerline of the first pad column that is parallel to the first direction,
• wherein each first pad has an area larger than an area of each second pad and an area of each third pad,
• wherein, among adjacent first, second, and third pads along the second direction, centerlines of the second pad and the third pad along the second direction match a centerline of the first pad along the second direction,
• wherein the circuit board includes a fourth pad column of fourth pads, a fifth pad column of fifth pads, and a sixth pad column of sixth pads respectively provided on the surface of the circuit board opposing the second surface of the terminal board, at positions opposing the first pad column, the second pad column, and the third pad column of the terminal board, respectively, and
• wherein mutually opposing pads of the first pad column and the fourth pad column, the second pad column and the fifth pad column, and the third pad column and the sixth pad column are respectively bonded by a bonding material.