To provide a passenger airplane having a cabin structure for preventing a hijacking.

A door 4 provided in a bulkhead 3 between a cockpit 1 and a passenger cabin 2 of the passenger airplane is composed so it cannot be opened from a passenger cabin side, or passage between the cockpit 1 and the passenger cabin 2 is prevented at least after passengers are on board by abolishing the door 4 and providing an exclusive entrance 7 for access of a cockpit crew to the cockpit instead. Furthermore, when a hijacking occurs, an anesthetic or a narcotic is ejected into the passenger cabin 2 from a chemical tank provided inside by a switch operation of the cockpit crew or a cabin crew, and hijackers in the passenger cabin 2 are temporarily knocked out or paralyzed and restrained (the cabin crew and passengers are also knocked out or paralyzed at the same time).