A solenoid valve device comprising: a solenoid valve unit including a spool, a sleeve configured such that the spool is internally disposed movably in an axial direction, a valve portion movable by the spool, an armature configured to move the spool, a molded solenoid component disposed around an outer periphery of the armature and having a solenoid portion disposed therein, and a solenoid case with the armature and the molded solenoid component housed therein; and a valve housing provided with an attachment hole into which the sleeve of the solenoid valve unit is inserted; wherein the solenoid valve unit further comprises: a breathing hole extending in a radial direction through the sleeve on a side of the solenoid portion and bringing a first space, which is formed between the armature and the spool when the armature is at least in a predetermined region, into communication with an outside; a first opening facing a side of the valve portion and opening to the outside; a second opening opening to the outside; and a breathing channel in the solenoid case, said breathing channel communicating at an end thereof with the first opening and communicating at an opposite end thereof with the second opening, the solenoid valve device being characterized by the solenoid valve unit and the valve housing being fixed together with an annular seal (40, 11k) interposed around the sleeve so that a passage between the breathing hole and the first opening of the solenoid valve unit is ensured and a passage between the breathing hole and the outside is cut off, wherein the annular seal (40, 11k) is an annular member having an inner diameter greater than an outer diameter of the sleeve and having an inner diameter greater than that of the attachment hole of the valve housing, and wherein the annular seal (40, 11k) has a circular ring shape continuously extending in a circumferential direction, and by the breathing hole communicating with a second space which is surrounded by an upper wall of the molded solenoid component, a side wall of the first opening of the solenoid case, an outer periphery of the sleeve, an upper wall of the solenoid case, an outer wall of the valve housing, and an inner peripheral wall of the annular seal (40, 11k), wherein the second space includes a third space which is surrounded by the outer periphery of the sleeve, the upper wall of the solenoid case, the outer wall of the valve housing, and the inner peripheral wall of the annular seal (40, 11k). a solenoid valve unit including a spool, a sleeve configured such that the spool is internally disposed movably in an axial direction, a valve portion movable by the spool, an armature configured to move the spool, a molded solenoid component disposed around an outer periphery of the armature and having a solenoid portion disposed therein, and a solenoid case with the armature and the molded solenoid component housed therein; and a spool, a sleeve configured such that the spool is internally disposed movably in an axial direction, a valve portion movable by the spool, an armature configured to move the spool, a molded solenoid component disposed around an outer periphery of the armature and having a solenoid portion disposed therein, and a solenoid case with the armature and the molded solenoid component housed therein; and a valve housing provided with an attachment hole into which the sleeve of the solenoid valve unit is inserted; a breathing hole extending in a radial direction through the sleeve on a side of the solenoid portion and bringing a first space, which is formed between the armature and the spool when the armature is at least in a predetermined region, into communication with an outside; a first opening facing a side of the valve portion and opening to the outside; a second opening opening to the outside; and a breathing channel in the solenoid case, said breathing channel communicating at an end thereof with the first opening and communicating at an opposite end thereof with the second opening, the solenoid valve device being characterized by the solenoid valve unit and the valve housing being fixed together with an annular seal (40, 11k) interposed around the sleeve so that a passage between the breathing hole and the first opening of the solenoid valve unit is ensured and a passage between the breathing hole and the outside is cut off, wherein the annular seal (40, 11k) is an annular member having an inner diameter greater than an outer diameter of the sleeve and having an inner diameter greater than that of the attachment hole of the valve housing, and wherein the annular seal (40, 11k) has a circular ring shape continuously extending in a circumferential direction, and by the breathing hole communicating with a second space which is surrounded by an upper wall of the molded solenoid component, a side wall of the first opening of the solenoid case, an outer periphery of the sleeve, an upper wall of the solenoid case, an outer wall of the valve housing, and an inner peripheral wall of the annular seal (40, 11k), wherein the second space includes a third space which is surrounded by the outer periphery of the sleeve, the upper wall of the solenoid case, the outer wall of the valve housing, and the inner peripheral wall of the annular seal (40, 11k).