It is aimed to suppress a projecting amount from a printed board. A male connector (M) is mounted on a printed board (P). A male connector housing (30) is formed with an inner receptacle (31) formed into a tubular shape open in one direction and fittable in a sealed state into a space between a terminal accommodating portion (4) and an outer tube portion (6) in a female connector (F) and an outer receptacle (33) formed into a tubular shape open in the same direction as the inner receptacle (31) while surrounding the inner receptacle (31), the outer tube portion (6) of the female connector (F) is fittable between the inner receptacle (31) and the outer receptacle (33), and the outer receptacle (33) is mountable on the printed board (P).