Abstract: An injection device (1) has a slide (3) which can be displaced in relation to a housing (2) from a retracted position to an injection position, and which comprises a portion (8) situated within the housing (2) and a portion (6) situated outside the housing, both portions (6, 8) being interconnected through a groove (10) in the housing (2). The portion (6) situated outside the housing (2) has a syringe holder (5) for securing a hypodermic syringe (4), and the slide (3) is pretensioned toward the injection position. The housing (2) at the groove (10) is constituted by a tube part, the outer and/or inner surface (7, 9) of which forms a guide for the slide (3), and the slide (3) has one or more contact faces which are in contact with the guide at least at three areas distributed over more than the half of the circumference of the tube part.