To obtain an image forming apparatus capable of suppressing a color shift, without increasing the size of an apparatus body.
The correction value of an exposure timing by an exposure device 36 is calculated based on a conveyance timing, that is, such a timing that a sheet member P is fed by an alignment roll 32 or an arrival timing, that is, such a timing that the sheet member P arrives at an image holder 16 on the upstream side, as a reference, so that the color shift of each color in the conveyance direction of the sheet member P can be more suppressed as compared with the case where the detection signal of a sensor, etc. arranged between the image holders 16 for each color is used as a reference, without increasing the size of an apparatus body 10A.
Kato Kazunori
Hiroshi Fukuda
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