A back board has a spacing member having elasticity larger than that of a spacing
member formed on a display board, and the spacing member of the back board is joined
with the spacing member formed on the display board. Cells are formed between the
display board and the back board, and black particles and white particles which
are moved by an applied electric field are sealed into the cells. Even when there
is variance in heights of the spacing members on the display board and the back
board, the spacing member on the back board side is elastically deformed so as
to absorb the variance. As a result, the spacing member on the display board is
brought into close contact with the spacing member on the back board with certainty,
so that the particles sealed into the cells can be prevented from moving between
the cells.