| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide a concentration detector for exactly measuring concentration of a liquid being an object to be measured even if transmittance of the liquid is different, and to provide an image forming apparatus. Ž<P>SOLUTION: The concentration detector includes: a rotating member 122 rotating centering around a rotary shaft 121; a light-emitting element 131a emitting light; light-emitting element holding parts 131b, 131c and 131d holding the light-emitting element 131a; a light-receiving element 132a disposed at a position where an optical path of the light from the light-emitting element 131a is not parallel with the rotary shaft 121; and light-receiving element holding parts 132b, 132c and 132d holding the light-receiving element 132a and forming a gap 133 through which the rotating member 122 moves with the light-emitting element holding parts 131b, 131c and 131d. Ž<P>COPYRIGHT: (C)2010,JPO&INPIT Ž
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