Disclosed is a magnetic annealing apparatus including a carrier conveyance region and a workpiece conveyance region. The carrier conveyance region includes: a first mounting table where a carrier is disposed; second mounting tables where carriers convey workpieces from the carrier conveyance region to the workpiece conveyance region; a storage unit; and a carrier conveyance mechanism that performs carrying-out/carrying-in of the carriers. The workpiece conveyance region includes: an aligner device; a workpiece boat; a workpiece conveyance mechanism that conveys the workpieces from the carriers disposed on the second mounting tables to the workpiece boat via the aligner device; a heating unit; a magnetic field generating unit; and a transfer mechanism that transfers the workpieces held by the workpiece boat into the magnetic field generating unit.