A medical liquid supply device that includes: a container including a containing portion with a mouth (16)； an interior cap (30)； and an exterior cap (60). The interior and exterior caps (30, 60) include a ratchet mechanism (50, 80). The interior cap (30) includes: an interior-cap main body (32) and an interior-cap protrusion (54). The interior-cap main body (32) includes a contact ring (44). The exterior cap (60) includes: an exterior-cap main body (62)； and an exterior-cap protrusion (84) configured to be engaged with the interior-cap protrusion (54). The contact ring (44) is distant from the interior-cap protrusion (54) in the radial direction of the interior-cap main body (32).
