A stacking connector has a first connector and a second connector respectively mounted on wiring boards and pressed against each other in a predetermined direction to be mated with each other, thereby electrically connecting the wiring boards. The first connector has a projection projecting in the same direction as the predetermined direction. The second connector has: a turning section that is turnable on a turning shaft disposed in a direction intersecting the predetermined direction, and having a first portion that enables turning of the turning section by being pressed by the projection when the first and second connectors are pressed against each other; and a wall section that conceals the turning section and has an opening formed therethrough at a position reached by a second portion of the turning section as a result of turning of the turning section when mating of the first and second connectors is completed.