A seating sensor for a vehicle seat comprising: a film-like main body with flexibility adapted to be laid, between a surface on a seating side of a pad member of a cushion portion of the vehicle seat partly with a concave portion formed to be depressed and a skin member attached to the pad member to cover the surface on the seating side, across the concave portion and having a plurality of detecting sections (21 a) for detecting a passenger seating on the pad member in contact with the surface on the seating side of the pad member, an output section (21 b) for outputting signals detected by the detecting sections (21 a), and a continuity section (21 c) for transmitting the signals detected by the detecting sections (21 a) to the output section (21 b); and a holding member configured to curve and hold a part of the continuity section (21 c) constituting region of the film-like main body and to be able to be received together with the curved continuity section constituting region (21 c) in the concave portion and having a pair of facing wall portions (32a, 32b) facing inside surfaces of the concave portion and a connection portion connecting respective one ends of the facing wall portions (32a, 32b) for covering a surface on at least one side of the curved continuity section constituting region (21 c) by the facing wall portions (32a, 32b) and the connection portion, characterized in that the pair of facing wall portions (32a, 32b) and the connection portion are configured to include an inside protection wall which curves and holds the continuity section constituting region (21 c) while covering the surface on the skin member side of the continuity section constituting region (21 c), and an outside protection wall which curves and holds the continuity section constituting region (21 c) while covering a surface on the pad member side of the continuity section constituting region (21 c), and the holding member has a flexible connection portion (62, 70) which connects parts at one end in a width direction of the inside protection wall and the outside protection wall and which makes the inside and outside protection walls (32, 33) pivotable relatively about the connection portion. a film-like main body with flexibility adapted to be laid, between a surface on a seating side of a pad member of a cushion portion of the vehicle seat partly with a concave portion formed to be depressed and a skin member attached to the pad member to cover the surface on the seating side, across the concave portion and having a plurality of detecting sections (21 a) for detecting a passenger seating on the pad member in contact with the surface on the seating side of the pad member, an output section (21 b) for outputting signals detected by the detecting sections (21 a), and a continuity section (21 c) for transmitting the signals detected by the detecting sections (21 a) to the output section (21 b); and a holding member configured to curve and hold a part of the continuity section (21 c) constituting region of the film-like main body and to be able to be received together with the curved continuity section constituting region (21 c) in the concave portion and having a pair of facing wall portions (32a, 32b) facing inside surfaces of the concave portion and a connection portion connecting respective one ends of the facing wall portions (32a, 32b) for covering a surface on at least one side of the curved continuity section constituting region (21 c) by the facing wall portions (32a, 32b) and the connection portion, characterized in that the pair of facing wall portions (32a, 32b) and the connection portion are configured to include an inside protection wall which curves and holds the continuity section constituting region (21 c) while covering the surface on the skin member side of the continuity section constituting region (21 c), and an outside protection wall which curves and holds the continuity section constituting region (21 c) while covering a surface on the pad member side of the continuity section constituting region (21 c), and the holding member has a flexible connection portion (62, 70) which connects parts at one end in a width direction of the inside protection wall and the outside protection wall and which makes the inside and outside protection walls (32, 33) pivotable relatively about the connection portion.