A clutch device comprising: a clutch housing provided to be rotatable about an axis extending in the axial direction; a clutch boss that has a boss portion surrounding the axis and having an inner peripheral surface and a first outer peripheral surface, and an annular pressure-receiving surface that projects outwardly in radial direction with regard to the axis from the boss portion, and is provided in the clutch housing to be rotatable about the axis; a pressure member that has a fitting portion being fitted into the boss portion and having a second outer peripheral surface, and an annular pressure surface opposite to the pressure-receiving surface, and is configured to be movable in an axial direction, which is the axial direction, relative to the clutch boss and rotatable relative to the clutch boss; a plurality of friction plates (81, 82) provided between the pressure-receiving surface and the pressure surface; and an oil supplier that is configured to supply oil into the boss portion, wherein the clutch boss and the pressure member respectively have a first cam surface and a second cam surface that are abuttable against each other and separable from each other by relative rotation between the clutch boss and the pressure member, a first concave portion that is configured to guide oil from the oil supplier to a tip of the boss portion is formed at the inner peripheral surface of the boss portion, characterized in that the clutch device further comprises: a second concave portion that is configured to guide oil from the oil supplier to the pressure surface is formed at the second outer peripheral surface of the pressure member to be at least partially opposite to the first concave portion, and a third concave portion that is configured to guide oil guided by the first concave portion and the second concave portion to at least one friction plate including a friction plate located closest to the pressing surface is formed at the pressure surface. a clutch housing provided to be rotatable about an axis extending in the axial direction; a clutch boss that has a boss portion surrounding the axis and having an inner peripheral surface and a first outer peripheral surface, and an annular pressure-receiving surface that projects outwardly in radial direction with regard to the axis from the boss portion, and is provided in the clutch housing to be rotatable about the axis; a pressure member that has a fitting portion being fitted into the boss portion and having a second outer peripheral surface, and an annular pressure surface opposite to the pressure-receiving surface, and is configured to be movable in an axial direction, which is the axial direction, relative to the clutch boss and rotatable relative to the clutch boss; a plurality of friction plates (81, 82) provided between the pressure-receiving surface and the pressure surface; and an oil supplier that is configured to supply oil into the boss portion, wherein the clutch boss and the pressure member respectively have a first cam surface and a second cam surface that are abuttable against each other and separable from each other by relative rotation between the clutch boss and the pressure member, a first concave portion that is configured to guide oil from the oil supplier to a tip of the boss portion is formed at the inner peripheral surface of the boss portion, characterized in that the clutch device further comprises: a second concave portion that is configured to guide oil from the oil supplier to the pressure surface is formed at the second outer peripheral surface of the pressure member to be at least partially opposite to the first concave portion, and a third concave portion that is configured to guide oil guided by the first concave portion and the second concave portion to at least one friction plate including a friction plate located closest to the pressing surface is formed at the pressure surface. a second concave portion that is configured to guide oil from the oil supplier to the pressure surface is formed at the second outer peripheral surface of the pressure member to be at least partially opposite to the first concave portion, and a third concave portion that is configured to guide oil guided by the first concave portion and the second concave portion to at least one friction plate including a friction plate located closest to the pressing surface is formed at the pressure surface.