Provided are a syringe device and a syringe plunger, whereby fluid supplying and suction can easily be performed by one-handed operation, and suction amount and suction speed can be set to optimum values. A syringe device (600) is provided with: a cylindrical syringe body (602) having a nozzle (604) at the tip thereof； a first space (610) into which a portion of a wall surface is defined inside the syringe body (602)； a cylindrical plunger body (620) for making the volume of the first space (610) variable, the plunger body (620) being configured so as to be able to slide in an axial direction through the inside of the syringe body (602)； a second space (624) into which a portion of a wall surface is defined inside the plunger body (620)； a cylindrical plunger rod (660) for making the volume of the second space (624) variable, the plunger rod (660) being configured so as to be able to slide in the axial direction through the inside of the plunger body (620)； a coil spring (668) for urging in a direction of expanding the volume of the second space (624), the coil spring (668) being provided between the plunger body (620) and the plunger rod (660)； a first communicating channel and a second communicating channel for communicating the first space (610) and the second space (624)； and a check valve member (632) for forming an orifice for restricting the flow of fluid between the first space (610) and the second space (624) in the first communicating channel, and a check valve for allowing the fluid to flow only from the second space (624) to the first space (610) in the second communicating channel.L'invention concerne un dispositif de seringue et un piston de seringue, permettant une alimentation et une aspiration du fluide faciles en n'utilisant qu'une seule main, et permettant de régler à des valeurs optimales la quantité d'aspiration et la vitesse d'aspiration. Un dispositif de seringue (600) est pourvu : d'un corps de seringue cylindrique (602) ayant une buse (604)
