A roof apparatus comprising: a plurality of panels (12, 13) that are juxtaposed in a vehicle longitudinal direction and configured to cover an opening formed in a roof of a vehicle and to adapt to the roof, a first panel serving as one of the plurality of panels being configured to be capable of opening and closing the opening in response to an ascending and descending operation; a pair of downward-erected walls (41a, 41a) that extend to both edge portions in a vehicle width direction of the first panel along the vehicle longitudinal direction, and that extend downward in a vehicle height direction; a sealing member that extends along the vehicle width direction on an edge portion of a second panel facing the first panel in the vehicle longitudinal direction, the second panel serving as one of the plurality of panels and being adjacent to the first panel and arranged in front of or behind the first panel in the vehicle longitudinal direction, the sealing member having a sealing portion which can be in liquid-tight contact with an edge end in the vehicle longitudinal direction of the first panel and a lower surface of the edge portion in the vehicle longitudinal direction of the first panel, characterized in that the sealing member has a tip portion in the vehicle longitudinal direction of the sealing member having a pair of notches which are recessed in a mode of approaching each other from both sides facing each other in the vehicle width direction so that both of the downward-erected walls (41 a; 41 a) can enter further downward in the vehicle height direction than a sealing surface of the sealing portion when the first panel is in a descended state; wherein the roof apparatus further comprises a pair of panel side protruding portions (41 c, 41 c) that are respectively disposed to protrude in the vehicle width direction where the pair of panel side protruding portions (41c; 41c) respectively face both of the downward-erected walls (41 a; 41 a), and that are arranged at predetermined positions within a range in the vehicle longitudinal direction of both of the notches, when the first panel is in the descended state. a plurality of panels (12, 13) that are juxtaposed in a vehicle longitudinal direction and configured to cover an opening formed in a roof of a vehicle and to adapt to the roof, a first panel serving as one of the plurality of panels being configured to be capable of opening and closing the opening in response to an ascending and descending operation; a pair of downward-erected walls (41a, 41a) that extend to both edge portions in a vehicle width direction of the first panel along the vehicle longitudinal direction, and that extend downward in a vehicle height direction; a sealing member that extends along the vehicle width direction on an edge portion of a second panel facing the first panel in the vehicle longitudinal direction, the second panel serving as one of the plurality of panels and being adjacent to the first panel and arranged in front of or behind the first panel in the vehicle longitudinal direction, the sealing member having a sealing portion which can be in liquid-tight contact with an edge end in the vehicle longitudinal direction of the first panel and a lower surface of the edge portion in the vehicle longitudinal direction of the first panel, characterized in that the sealing member has a tip portion in the vehicle longitudinal direction of the sealing member having a pair of notches which are recessed in a mode of approaching each other from both sides facing each other in the vehicle width direction so that both of the downward-erected walls (41 a; 41 a) can enter further downward in the vehicle height direction than a sealing surface of the sealing portion when the first panel is in a descended state; wherein the roof apparatus further comprises a pair of panel side protruding portions (41 c, 41 c) that are respectively disposed to protrude in the vehicle width direction where the pair of panel side protruding portions (41c; 41c) respectively face both of the downward-erected walls (41 a; 41 a), and that are arranged at predetermined positions within a range in the vehicle longitudinal direction of both of the notches, when the first panel is in the descended state.