The present invention relates to a connector. The connector includes: a housing; a plurality of the terminals arranged thereon for electrically contacting with a board; a pair of arms extending from two ends of the housing, respectively; a first projection and a second projection formed on each of the arms; and a metal member arranged along the length direction of each of the arms, having a hold-down portion and a first recess for engaging with the first projection with a first buffer space existing therebetween. The metal member is spaced from the second projection by a second buffer space. When the hold-down portion is soldered to a board, the first projection or the second projection may remedy overwarp of the board or the housing.