The connector for on-board mounting includes a housing body having multiple contacts, metal locking engagement members each having a locking portion to be engaged with a locked engagement member provided to a cable-side connector for a purpose of locking a connection between connectors and being fixed to the housing body and a metal outer shell member covering a side wall of a front portion of the housing body and provided with opening portions through which the locking engagement members pass. The opening portion of the outer shell member is provided such that an edge thereof which faces the opening portion and the locking engagement member are brought into contact with each other and the locking engagement members and the outer shell member are provided with board-connecting posts on rear portions to be disposed on a board.