A solenoid valve device includes a body including a gas passage and an accommodation portion communicating with the gas passage, a solenoid valve that is accommodated in the accommodation portion and that controls flow of gas by opening and closing the gas passage, a sealing member disposed between the accommodation portion and the solenoid valve to maintain airtightness of the gas passage, and a solenoid that generates power for the solenoid valve to open and close the gas passage, wherein the body is provided with a communication hole that allows communication between inside and outside of the accommodation portion; the solenoid includes a connection terminal portion extending toward the communication hole; and a connector is accommodated in the communication hole in a manner such that rotation of the connector in a circumferential direction about an axis of the communication hole is suppressed.