To provide a track concrete slab board of a tramcar for easily and quickly performing exchange working after durable period passage, and to provide its construction method.

The method for constructing the track concrete slab board of the tramcar can obtain a thin and lightweight track concrete slab board 10 at high strength by manufacturing the track concrete slab board 10 of the tramcar of floor slab-like precast prestressed concrete arranging a great number of PC steel materials 12 in the longitudinal direction of a rail, hangs the front part and the rear part of the precast prestressed concrete track concrete slab board 10 without receiving influence of a feeder or the like by a simple portal crane device, moves the portal crane device to move the track concrete slab board up to a prescribed position, and performs laying, exchange or the like of the track concrete slab board 10.