A connector comprising: a terminal that is connectable to an electric wire, and a housing, wherein the housing has a housing main body, the housing main body has a terminal accommodating chamber, the terminal accommodating chamber has a rectangular cross section in a direction orthogonal to a front-rear direction, the terminal accommodating chamber is molded from a front wall, an upper wall, two facing walls (242, 242), and a bottom wall, the upper wall and the bottom wall face each other in a vertical direction orthogonal to the front-rear direction, the two facing walls (242, 242) face each other in a width direction Y orthogonal to the front-rear direction and the vertical direction, the bottom wall has an elastically deformable lance connected at a base portion, the lance has a locking face facing a forward direction side which is an inserting direction of the terminal, the terminal has a box portion and a connecting portion, the box portion has a rectangular cross section in a direction orthogonal to the front-rear direction, the box portion has a ceiling plate, two facing plates (412, 412), and a bottom plate, the ceiling plate and the bottom plate face each other in the vertical direction, the two facing plates (412, 412) face each other in the width direction, the ceiling plate has at least a front ceiling plate molded by a notch reaching each facing plate outer face (412b, 412b) of the two facing plates (412, 412), the front ceiling plate has a locking target face facing a rearward direction side which is a detaching direction of the terminal, and in a state in which the terminal is accommodated in the terminal accommodating chamber, the locking face engages with the locking target face in a range wider than both facing plate inner face widths of the two facing plates (242, 242) in the width direction, characterized in that the lance has a lance main body and connecting arms (254, 254), wherein the locking face is provided on the lance main body, and in the lance main body, the rearward direction side is connected to the bottom wall at the base portion, and the forward direction side is connected to the front wall via the connecting arms (254, 254). a terminal that is connectable to an electric wire, and a housing, wherein the housing has a housing main body, the housing main body has a terminal accommodating chamber, the terminal accommodating chamber has a rectangular cross section in a direction orthogonal to a front-rear direction, the terminal accommodating chamber is molded from a front wall, an upper wall, two facing walls (242, 242), and a bottom wall, the upper wall and the bottom wall face each other in a vertical direction orthogonal to the front-rear direction, the two facing walls (242, 242) face each other in a width direction Y orthogonal to the front-rear direction and the vertical direction, the bottom wall has an elastically deformable lance connected at a base portion, the lance has a locking face facing a forward direction side which is an inserting direction of the terminal, the terminal has a box portion and a connecting portion, the box portion has a rectangular cross section in a direction orthogonal to the front-rear direction, the box portion has a ceiling plate, two facing plates (412, 412), and a bottom plate, the ceiling plate and the bottom plate face each other in the vertical direction, the two facing plates (412, 412) face each other in the width direction, the ceiling plate has at least a front ceiling plate molded by a notch reaching each facing plate outer face (412b, 412b) of the two facing plates (412, 412), the front ceiling plate has a locking target face facing a rearward direction side which is a detaching direction of the terminal, and in a state in which the terminal is accommodated in the terminal accommodating chamber, the locking face engages with the locking target face in a range wider than both facing plate inner face widths of the two facing plates (242, 242) in the width direction, characterized in that the lance has a lance main body and connecting arms (254, 254), wherein the locking face is provided on the lance main body, and in the lance main body, the rearward direction side is connected to the bottom wall at the base portion, and the forward direction side is connected to the front wall via the connecting arms (254, 254).