SOUND INSULATION MEMBER, AND VEHICULAR DOOR STRUCTURE

A sound insulation member (16) has a fitting portion (24) and a sealing portion (26). The fitting portion (24) is attached to at least one of a door front-side end portion and a door rear-side end portion of an inner weather strip that is disposed at an upper portion of a door inner panel, and is fitted into the inner weather strip. The sealing portion (26) fills a gap between the inner weather strip and the door inner panel.