A syringe includes a barrel, a plunger, an injection needle, and an injection needle safety instrument. The injection needle safety instrument has a base portion fixed to the barrel, a cover portion which can cover a pointed end of a needle tube of the injection needle, and a hinge portion which pivotably couples the base portion and the cover portion. The cover portion is constructed to be pivotable between a first position at which the cover portion is held to the base portion as a first locked portion is locked by a locking portion of the base portion and a second position at which the cover portion covers the pointed end of the needle tube and is held to the injection needle as a second locked portion is locked to the same. The cover portion is tilted toward the barrel in the first position.