To provide a unit wall having high earthquake resistance and a wall having it.

In this wall unit including a concrete-made wall body 11 and a reinforcing member 12 connected to the wall body to reinforce the wall body, the wall body 11 and the reinforcing member 12 are integrated with each other to form a plate-like unit. In the wall body 11, a recessed part 11B is formed on at least one surface, and the reinforcing member 12 is stored in the recessed part 11B to be connected to each other. The reinforcing member 12 is formed as a lightweight member having a smaller specific gravity than that of concrete material 11.