To close a receiving section when not in playing with sand for holding hygienically the sand in a sand box by providing an intrusion prevention member connected with the receiving section to receive the sand and closed to prevent the received sand from the intrusion of an animal.

A receiving section 12 is constitutionally provided with a frame body 14 for receiving sand S, side bodies 16, 16, cross material 18 or the like. For example, and equilateral triangular side bodies 16 are provided nearly vertically to the short aside parts 14b of the frame body 14 to secure both ends of the cross material 18 fixedly to apex connection parts of four inclined materials 16a. Two intrusion preventing members 20, 20 are connected through hinges 30 to the long side parts 14a of the frame body 14 to be opened and closed. When a body and a child play with sand, both intrusion preventing members 20 are opened to set the sand S is the receiving section 12 to the condition opened to the outside. However, when not in playing with the sand, both intrusion preventing members 20 are closed to surround the sand S completely with both intrusion preventing members 20 and end rails 16d, 16d of the receiving section 12 to prevent the sand S from the intrusion of a small animal.