A barrel (12) of a prefilled syringe (10) has a hollow body portion (18) configured such that a gasket (16) is slidably inserted. The barrel (12) is made of a resin having a total light transmittance of 80% or more in a measurement method according to ASTM-D 1003. A scale (38) is provided on an inner circumferential surface (12a) of the body portion (18). The scale (38) is formed by a stepped structure (40A) having a step height of 0.001 to 0.15 mm in a radial direction.
