To set a play place and a play implement easily to a desired place by forming a plurality of unit elements for constituting an assembling play implement with a receiving body having a space in the inside in which flui is poured and a connecting means provided in the receiving body to connect removably the unit elements to each other.

When two kinds of unit elements 12, 14 are interconnected to constitute a frame body 16 for a sand box for example, side plates 20, 20 of additional play implements are mounted to unit elements 12, 12 and a cross member 30 is secured fixedly to both side plates 20. A swing 40 is removably mounted to the cross member 30 and a slide 60 is mounted to a hole 50 formed in the side palter 20. Sand S is received in the frame body 16 to provide a sand box and a frame body 16 for a pool is disposed at the side of the frame body 16. The respective unit elements 12 have recesses of a connecting means, set hole 28 and water supply hole, and the unit elements 12, 14 are made heavy and difficult to move or fall by infusing water W.