Board connecting body

A board connecting body comprising:

• a pair of board cases, wherein each board case includes a housing;
• a printed circuit board received in the housing;
• a connector attached to the printed circuit board;
• and
• a locking part formed on the housing,
• wherein the pair of board cases are electrically connected to each other when connectors are fitted to each other, and the pair of the board cases are fixed to each other when the locking parts engage with each other,
• the board connecting body further comprising:
• a receiving wall part formed on the housing of one board case of the pair of the board cases, said receiving wall part being formed capable of receiving the housing of another board case of the pair of the board cases;
• a projection formed on one of the receiving wall part and the housing of the other board case, said projection projecting toward another of the receiving wall part and the housing of the other board case;
• and
• a groove formed on the other of the receiving wall part and the housing of the other board case, said projection being capable of entering said groove,
• wherein said groove includes:
• a straight part extending along a fitting direction of the connectors;
• and a receiving part which is formed from an outer edge of the other of the receiving wall part and the housing of the other board case to the straight part, said outer edge facing the one of the receiving wall part and the housing of the other board case, the receiving part being formed in such a manner that a width of the receiving part gradually decreases from said outer edge to the straight part.