Moisture detecting apparatus for recording material and image forming apparatus

A detection apparatus comprising:

• a first light emitting element configured to emit first light on a recording material;
• a second light emitting element configured to emit second light on the recording material;
• a light receiving unit configured to receive the first light and the second light transmitted through the recording material;
• and
• a rotation member configured to rotate and press the recording material, on which the first light and the second light is emitted, against a conveyance guide for guiding the recording material,
• wherein the rotation member includes a cylindrical member that contacts the recording material and an axis member that holds the cylindrical member,
• wherein, as viewed in a rotational axis direction of the rotation member, a first light path connecting the first light emitting element with the light receiving unit and a second light path connecting the second light emitting element with the light receiving unit overlap with the cylindrical member,
• wherein, as viewed in a conveyance direction of the recording material, the first light emitting element is arranged in a different area, in the rotational axis direction, from an area where the cylindrical member is arranged, and wherein, as viewed the rotation member in the conveyance direction of the recording material, the second light emitting element is arranged in a different area, in the rotational axis direction, from the area where the cylindrical member is arranged.