A vehicular door structure includes a door outer panel that constitutes a door exterior panel; a door inner panel that constitutes a door interior panel and is made of a resin, the door inner panel having a first side that is provided to the door outer panel; and a door interior member located on a second side of the door inner panel, the door interior member facing to the vehicle interior, wherein the door inner panel includes a panel part that has a plurality fragile portions, the fragile portions having a linear shape or a dotted line shape and being provided in parallel with each other while being spaced from each other in at least one direction of a door width direction and a door vertical direction.