Tubular molded foam with plate portion and method for forming the same

Provided is a tubular (101) molded foam with a plate portion capable of reliably preventing the occurrence of an unwanted lump on the inside of a tube body even when the molding is manufactured using a molten resin having a high expansion ratio. The tubular molded foam includes a tube body and a plate (103,104) portion joined with an outside of the tube body. The plate portion has a recess (106) in the vicinity of a joint surface with the tube body.