To provide a drug supply device which can reliably prevent accidental opening by an infant or child and which enables reducing the number of components. This drug supply device (1) is provided with a container (10) having a housing part (11) and an opening (16), an interior cap (30), and an exterior cap (60). The interior cap (30) and the exterior cap (60) have a ratchet mechanism (50, 80). The interior cap (30) has: an interior cap main body (32) which includes a contact ring (44) that can seal the container (10)； and a locking part (50). The exterior cap (60) has an exterior cap main body (62), and a locked part (80) which configures the ratchet mechanism together with the locking part (50). The contact ring (44) is provided in a position spaced away from the locking part (50) in the radial direction of the interior cap main body (32).[課題]提供可抑制由幼兒和小孩所進行的誤開封且可削減零件點數的藥液供給器具。 [技術內容]藥液供給器具(1)，具備：收容部(11)及口部(16)具有的容器(10)、及內裝帽(30)、及外裝帽(60)，內裝帽(30)及外裝帽(60)，是具有棘輪機構(50、80)，內裝帽(30)，是具有：包含可將容器(10)內密閉的接觸環(44)的內裝帽本體(32)、及卡止部(50)，外裝帽(60)，是具有：外裝帽本體(62)、及與卡止部(50)一起構成棘輪機構的被卡止部(80)，接觸環(44)，是被設置在對於內裝帽本體(32)的徑方向從卡止部(50)分離的位置。
