Abstract: Provided is a fluid control device that can have a small size, while a member for detecting abnormality of the fluid control device is incorporated. In addition, a result of detecting an abnormality of the fluid control device is made easily recognizable from the outside. A fluid control device 1 includes an information processing module 5 provided in the device, a valve body 11 having a flow path, an actuator body 12 fixed to the valve body 11, a hollow casing 13 that is fixed to the actuator body 12 and has a side surface on which a through hole 133d is formed, a piston 126 that is provided in the actuator body 12 and in which a driving pressure introduction path 126b that communicates with a driving pressure introduction chamber S2 is formed, and an introduction pipe 21 through which driving pressure is introduced, the introduction pipe 21 having one end inserted to the driving pressure introduction path 126b and another end leading to an outside through the through hole 133d of the casing 13.