A connector is mountable on an object in an upper-lower direction and mateable with a mating connector along the upper-lower direction. The connector comprises a housing and an additional member held by the housing. The housing has a receiving portion for receiving the mating connector. The additional member has a fixed portion fixed to an object, a base portion which extends upward from the fixed portion and is located outside the receiving portion in a lateral direction, an armor portion extending inward from the base portion in the lateral direction, a spring portion extending from the base portion and a projection which is supported by the spring portion and projects inward in the lateral direction. The extending of the spring portion from the base portion starts at a starting portion which is nearer to the fixed portion than to the innermost part of the armor portion.