A connector device comprising a connector and a mating connector, wherein: the mating connector is mateable with and removable from the connector along a front-rear direction; under a mated state where the connector and the mating connector are mated with each other, the mating connector is positioned forward of the connector in the front-rear direction; the connector comprises at least one supporting portion, at least one lock portion and a receiving portion; the supporting portion has an elastic property and supports the lock portion; the lock portion is movable at least in a perpendicular direction by an elastic deformation of the supporting portion; wherein the perpendicular direction is perpendicular to the front-rear direction; the mating connector has at least one mating lock portion and an abutment portion; a relative position between the mating lock portion and the abutment portion in the front-rear direction is fixed in the mating connector at least one of the lock portion and the mating lock portion has an intersecting surface which intersects with both the front-rear direction and the perpendicular direction; under the mated state, the lock portion is pressed against the mating lock portion by the elasticity of the supporting portion at the intersecting surface to apply a rearward force in the front-rear direction to the mating lock portion; under the mated state, the abutment portion is positioned forward beyond the receiving portion in the front-rear direction and is brought into abutment against the receiving portion by the rearward force so that a rearward movement of the abutment portion beyond the receiving portion is regulated by the receiving portion; under the mated state, the mating lock portion is positioned inward of the lock portion in the perpendicular direction and the supporting portion presses the lock portion against the mating lock portion; the connector device further comprises a maintaining mechanism; and under the mated state, the maintaining mechanism is positioned outward beyond the supporting portion in the perpendicular direction and presses the supporting portion to maintain a state where the supporting portion presses the lock portion against the mating lock portion, characterized in that the maintaining mechanism comprises an additional elastic portion which is a spring extending from the supporting portion in a cantilever manner, and a pressing member; and under the mated state, the additional elastic portion is positioned between the supporting portion and the pressing member in the perpendicular direction and applies an inward force in the perpendicular direction to the supporting portion. the mating connector is mateable with and removable from the connector along a front-rear direction; under a mated state where the connector and the mating connector are mated with each other, the mating connector is positioned forward of the connector in the front-rear direction; the connector comprises at least one supporting portion, at least one lock portion and a receiving portion; the supporting portion has an elastic property and supports the lock portion; the lock portion is movable at least in a perpendicular direction by an elastic deformation of the supporting portion; wherein the perpendicular direction is perpendicular to the front-rear direction; the mating connector has at least one mating lock portion and an abutment portion; a relative position between the mating lock portion and the abutment portion in the front-rear direction is fixed in the mating connector at least one of the lock portion and the mating lock portion has an intersecting surface which intersects with both the front-rear direction and the perpendicular direction; under the mated state, the lock portion is pressed against the mating lock portion by the elasticity of the supporting portion at the intersecting surface to apply a rearward force in the front-rear direction to the mating lock portion; under the mated state, the abutment portion is positioned forward beyond the receiving portion in the front-rear direction and is brought into abutment against the receiving portion by the rearward force so that a rearward movement of the abutment portion beyond the receiving portion is regulated by the receiving portion; under the mated state, the mating lock portion is positioned inward of the lock portion in the perpendicular direction and the supporting portion presses the lock portion against the mating lock portion; the connector device further comprises a maintaining mechanism; and under the mated state, the maintaining mechanism is positioned outward beyond the supporting portion in the perpendicular direction and presses the supporting portion to maintain a state where the supporting portion presses the lock portion against the mating lock portion, characterized in that the maintaining mechanism comprises an additional elastic portion which is a spring extending from the supporting portion in a cantilever manner, and a pressing member; and under the mated state, the additional elastic portion is positioned between the supporting portion and the pressing member in the perpendicular direction and applies an inward force in the perpendicular direction to the supporting portion.