Ink-jet recording apparatus that ensures accurate position detection of widthwise end portion of recording medium

An ink-jet recording apparatus, comprising:

• a belt conveying unit including a conveyance belt to convey a recording medium;
• a recording unit arranged facing the belt conveying unit, the recording unit discharging ink to the recording medium conveyed by the belt conveying unit;
• an end-portion position detection sensor arranged in an upstream of the belt conveying unit in a recording medium conveyance direction, the end-portion position detection sensor using a reflected light to detect a position of an end portion of the recording medium in a recording medium width direction intersecting with the recording medium conveyance direction;
• a background member arranged facing a detection surface of the end-portion position detection sensor, the background member being rotatable around a shaft extending along the recording medium width direction;
• a rotary driving unit that rotates the background member;
• and
• a recording medium sensor that detects a reflectivity or a color of the recording medium,
• wherein the background member has an outer peripheral surface at least in a region facing the detection surface of the end-portion position detection sensor, the outer peripheral surface having two or more regions having mutually different colors circumferentially dividing the outer peripheral surface, and
• wherein the rotary driving unit rotates the background member corresponding to a detection result of the recording medium sensor to change the region facing the detection surface of the end-portion position detection sensor in the background member such that an intensity difference between a reflected light from the background member and a reflected light from the recording medium increases.