An instrument panel integrally including an airbag door, comprising: a base member in which an aperture portion is formed; an airbag door that covers the aperture portion with a door main body portion that is attached to the base member, a cross-sectional shape of the door main body portion as viewed in a vehicle width direction being formed in a recessed shape that curves so as to recess toward the opposite side thereof from a vehicle cabin; a cover layer that is formed as a layer along surfaces of the base member and the door main body portion, the cover layer forming a concave design surface that curves so as to recess toward the opposite side thereof from the vehicle cabin; a pair of hinge portions (24G, 24H) formed at each of two curvature direction end sides of the door main body portion; and an intended splitting portion that is formed in a reduced thickness form in the door main body portion, the intended splitting portion partitioning the door main body portion into at least a curvature direction one side door portion and a curvature direction other side door portion, and the intended splitting portion splitting together with the cover layer when the curvature direction one side door portion and the curvature direction other side door portion receive, from the opposite side thereof from the vehicle cabin, inflation pressure of an airbag and open toward the vehicle cabin side thereof about the pair of hinge portions (24G, 24H), characterized in that the intended splitting portion is formed by a groove portion being formed at the side of the door main body portion at which the cover layer is provided. a base member in which an aperture portion is formed; an airbag door that covers the aperture portion with a door main body portion that is attached to the base member, a cross-sectional shape of the door main body portion as viewed in a vehicle width direction being formed in a recessed shape that curves so as to recess toward the opposite side thereof from a vehicle cabin; a cover layer that is formed as a layer along surfaces of the base member and the door main body portion, the cover layer forming a concave design surface that curves so as to recess toward the opposite side thereof from the vehicle cabin; a pair of hinge portions (24G, 24H) formed at each of two curvature direction end sides of the door main body portion; and an intended splitting portion that is formed in a reduced thickness form in the door main body portion, the intended splitting portion partitioning the door main body portion into at least a curvature direction one side door portion and a curvature direction other side door portion, and the intended splitting portion splitting together with the cover layer when the curvature direction one side door portion and the curvature direction other side door portion receive, from the opposite side thereof from the vehicle cabin, inflation pressure of an airbag and open toward the vehicle cabin side thereof about the pair of hinge portions (24G, 24H), characterized in that the intended splitting portion is formed by a groove portion being formed at the side of the door main body portion at which the cover layer is provided.