A combined container-syringe includes a body that has an outer tube to be filled with a drug solution. A cylindrical tip is attached to a front end portion of the outer tube and to a front end portion of which an injection needle is attached. A cylindrical safety device is attached on an outer circumferential surface of the outer tube in a freely sliding manner. A first retaining member fixes the safety device in a disengageable manner at a first position where the safety device is separated from the injection needle. A second retaining member fixes the safety device at a second position where the safety device covers the injection needle. A biasing member biases the safety device in the direction from the first position to the second position. A latch releasing member releases the engagement by the first retaining member.
