Exemplary embodiments can provide a fluid control valve, which reduces or prevents any bubble from being built up in the valve itself so as to protect other hydraulic equipment placed in a downstream side from having any malfunction due to such a bubble, and a droplet ejection device using the fluid control valve. A fluid control valve includes a tank, through which a fluid passes, an inlet port, through which a fluid flows into the tank, an outlet port, through which a fluid flows out of the tank, a valve plug that opens and closes at least one of the inlet port and the outlet port, a coupler connecting part of the inlet port side, which is located in an inlet passage connected to the inlet port, and a coupler connecting part of the outlet port side, which is located in an outlet passage connected to the outlet port. Piping is connected to the coupler connecting part of the inlet port side and the coupler connecting part of the outlet port side, each by using a coupler. An annular element for the purpose of offsetting a shoulder part caused by a difference in flow passage diameter existing between each of the coupler connecting parts of the inlet port side and outlet port side and the corresponding coupler can be placed at each of the coupler connecting part of the inlet port side and the coupler connecting part of the outlet port side.