To provide a door and a door device which are capable of improving aesthetic appearance and allowing a pet to smoothly pass through a passageway.SOLUTION: A door includes a door body provided with a rectangular passage opening through which a pet can pass, a small door which swings around a pivotal axis along an upper edge of the passage opening to open and close the passage opening, and a locking mechanism for locking the small door. The locking mechanism includes a rod-shaped body incorporated in the small door so as to be retractable in a lateral direction along one surface of the door body from the small door, an operation protrusion protruding from the lower end of the small door in a direction along one face of the small door when the small door is closed and operated when protruding and retracting the rod-like body, and a lock hole provided on a part of the door main body that faces the rod-shaped body when the small door is closed, the lock hole being formed in a configuration in which a projecting portion of the rod-like body from the small door is inserted and vice versa. When the projecting portion is inserted into the lock hole, the small door is locked.SELECTED DRAWING: Figure 2【課題】美観を向上させることができ、ペットが通行口をスムーズに通り抜けることができるドア及びドア装置を提供する。【解決手段】ドアは、ペットが通り抜け可能な矩形状の通行口が設けられているドア本体と、前記通行口の上縁に沿う枢軸周りに揺動し、前記通行口を開閉する小扉と、該小扉を施錠するための施錠機構とを備え、前記施錠機構は、前記小扉から前記ドア本体の一面に沿う横方向に出没可能に前記小扉の内部に組み込まれている棒状体と、前記小扉が閉じている場合の該小扉の下端から前記小扉の一面に沿う方向に突出するよう前記棒状体に突設されており、該棒状体を出没させる場合に操作される操作突起と、前記小扉が閉じている場合に前記棒状体が対向する前記ドア本体の一部に設けられており、前記棒状体の前記小扉からの突出部分が挿脱されるロック穴とを有し、前記突出部分が前記ロック穴に挿入されることによって前記小扉が施錠される。【選択図】図２
