An animal litter box comprising: an excreta container having an open portion at top side face; and a hood disposed to cover the open portion of the excreta container, wherein the hood comprises: a fixed hood disposed at a backside that is one end of the excreta container; a movable hood disposed at a front side that is an opposite side to the backside of the excreta container, and a pair of linking portions that rotatably links the movable hood; wherein the movable hood is formed with an opening that connects an inner space of the animal litter box to an outside space; the opening is disposed at the front side; when the movable hood is open, the front side at the open portion is exposed, and the bottom portion is exposed; and when the movable hood is changed from a closed state to an opened state, a protruding height that is a difference of a height of the highest portion in the track of movable hood movement and a height of the highest portion of the animal litter box when the movable hood is closed is lower than the height of the movable hood, characterized in that the excreta container has a liquid-permeable bottom portion and a lower container is positioned below the excreta container, having a drawable draw tray that collects liquid that passed through the bottom portion and an insertion inlet is disposed at the front side to insert the draw tray; and in that the movable hood and the fixed hood have an overlapping portion that overlaps when the movable hood is closed, and the pair of linking portion links the movable hood to the fixed hood at a portion of the overlapping portion, wherein the pair of linking portions includes: a pair of projecting shafts that projects from outside surfaces at a pair of support portions formed to extend from a top in the side edge of the backside of the movable hood to the backside; a pair of cavities formed in inside surfaces in a pair of long convex guide portions formed at top surface side of the fixed hood, equipped to extend from the front side to the backside; and a guide channel that extends in a substantially horizontal direction toward the backside are formed from each of the pair of cavities; when the movable hood is changed from a closed state to an opened state, the movable hood is rotated substantially 90 degrees so that the hood side handle portion moves to a top side, and when the movable hood is rotated, the movable hood is disposed to be set at the top surface of the fixed hood by the projecting shaft moving substantially horizontally being guided by the guide channel. an excreta container having an open portion at top side face; and a hood disposed to cover the open portion of the excreta container, wherein the hood comprises: a fixed hood disposed at a backside that is one end of the excreta container; a movable hood disposed at a front side that is an opposite side to the backside of the excreta container, and a pair of linking portions that rotatably links the movable hood; wherein the movable hood is formed with an opening that connects an inner space of the animal litter box to an outside space; the opening is disposed at the front side; when the movable hood is open, the front side at the open portion is exposed, and the bottom portion is exposed; and when the movable hood is changed from a closed state to an opened state, a protruding height that is a difference of a height of the highest portion in the track of movable hood movement and a height of the highest portion of the animal litter box when the movable hood is closed is lower than the height of the movable hood, the movable hood and the fixed hood have an overlapping portion that overlaps when the movable hood is closed, and the pair of linking portion links the movable hood to the fixed hood at a portion of the overlapping portion, wherein the pair of linking portions includes: a pair of projecting shafts that projects from outside surfaces at a pair of support portions formed to extend from a top in the side edge of the backside of the movable hood to the backside; a pair of cavities formed in inside surfaces in a pair of long convex guide portions formed at top surface side of the fixed hood, equipped to extend from the front side to the backside; and a guide channel that extends in a substantially horizontal direction toward the backside are formed from each of the pair of cavities; when the movable hood is changed from a closed state to an opened state, the movable hood is rotated substantially 90 degrees so that the hood side handle portion moves to a top side, and when the movable hood is rotated, the movable hood is disposed to be set at the top surface of the fixed hood by the projecting shaft moving substantially horizontally being guided by the guide channel.