A syringe kit for mixing two medicinal chemicals which can prevent stick and slip phenomena which tend to occur when the tip portion of one barrel and the tip portion of the other barrel are screwed together is provided.When a male screw 2C on the outer periphery of a connecting tube portion 2B of a first barrel 2 and a female screw 4F on the inner periphery of the screw tube portion 4D of a second barrel 4 are screwed together, and an inner tapered surface on the inner periphery of the connecting tube 2B of the first barrel 2 and an outer tapered surface 4E of the nozzle portion 4C of the second barrel 4 are fitted, because at least either of the surface of the male screw 2C of the connecting tube portion 2B of the first barrel 2 and the surface of the female screw 4F of the screw tube portion 4D of the second barrel 4 is roughened to a surface roughness in a range between Ra1.0 and Ra2.0, it is possible to prevent stick and slip phenomena therebetween
