  We have extracted a total of 1968 Mira variables from the OGLE-II data base
in the Galactic bulge region. Among them, 1960 are associated with 2MASS
sources, and 1541 are further identified with MSX point sources. Their
photometric properties are compared with those of Mira variables in the Large
and Small Magellanic Clouds. We have found that mass-losing stars with
circumstellar matter are reddened such that the colour dependence of the
absorption coefficient is similar to that of interstellar matter. We also
discuss the structure of the bulge. The surface number density of the bulge
Mira variables is well correlated with the 2.2-micron surface brightness
obtained by the COBE satellite. Using this relation, the total number of Mira
variables in the bulge is estimated to be about 600,000. The logP-K relation of
the Mira variables gives their space distribution which supports the well-known
asymmetry of the bar-like bulge.
