A gas solenoid valve, comprising: a housing including a first port, a second port, and a valve port leading to the first port and the second port; a main valve body capable of moving between a closed position and an open position and configured to move in an opening direction by pressure of gas supplied through the first port, the closed position being a position of the main valve body closing the valve port, the open position being a position of the main valve body opening the valve port; a guide member disposed having one end facing the valve port, the guide member including an inner hole in which the main valve body is inserted to guide the main valve body between the closed position and the open position; a first biasing member that is disposed in a housing space and biases the main valve body in the opening direction, the housing space being formed inward of the guide member to surround the main valve body; a second biasing member that provides, to the main valve body, a biasing force opposing a biasing force of the first biasing member to position the main valve body in the closed position; and an electromagnetic drive device that generates an excitation force to cause the main valve body to move to the open position, the excitation force opposing the biasing force of the second biasing member, wherein: the housing space is spaced apart from the one end of the guide member in the opening direction; characterized in that a buffer groove is formed at the one end of the guide member to surround an opening end of the inner hole of the guide member. a housing including a first port, a second port, and a valve port leading to the first port and the second port; a main valve body capable of moving between a closed position and an open position and configured to move in an opening direction by pressure of gas supplied through the first port, the closed position being a position of the main valve body closing the valve port, the open position being a position of the main valve body opening the valve port; a guide member disposed having one end facing the valve port, the guide member including an inner hole in which the main valve body is inserted to guide the main valve body between the closed position and the open position; a first biasing member that is disposed in a housing space and biases the main valve body in the opening direction, the housing space being formed inward of the guide member to surround the main valve body; a second biasing member that provides, to the main valve body, a biasing force opposing a biasing force of the first biasing member to position the main valve body in the closed position; and an electromagnetic drive device that generates an excitation force to cause the main valve body to move to the open position, the excitation force opposing the biasing force of the second biasing member, wherein: the housing space is spaced apart from the one end of the guide member in the opening direction; characterized in that a buffer groove is formed at the one end of the guide member to surround an opening end of the inner hole of the guide member. the housing space is spaced apart from the one end of the guide member in the opening direction; characterized in that a buffer groove is formed at the one end of the guide member to surround an opening end of the inner hole of the guide member.