PASSENGER PROTECTION DEVICE

A passenger protection device has a seat, a seat belt for restraining a passenger seated on the seat, an airbag disposed on the seat belt in a lap belt which restrains a waist of the passenger seated on the seat while the seat belt is worn, and an inflator disposed close to a lower end of the seat and supplying inflation gas to the airbag. The airbag includes a bag body formed of a flexible sheet body and inflated to protect the passenger, and a conduit part connected to the inflator and allowing the inflation gas to flow into the bag body. The conduit part is disposed between a seat part of the seat and a side cover covering a lateral side of the seat part, in a state of being held by a holder attached to a seat frame side of the seat.