Passenger seat device

A passenger seat device with a mounting unit for mounting on a mounting plane, with two seat structure elements, which are in each case arranged on a respective side of a sitting area, with two bearing elements, wherein respectively one bearing element is fixedly connected with one of the seat structure elements, with a backrest comprising at least one pivotable backrest element which is pivotably supported on the seat structure elements via the bearing elements, with at least one reset module comprising at least one spring element to provide a resetting force for restoring the pivotable backrest element from a comfort position into an upright seat position, and with a locking device which is configured for locking the pivotable backrest element at least in the upright seat position, wherein the locking device comprises at least one locking module, which is arranged between the first seat structure element and a load-bearing element of the pivotable backrest element.