MANUFACTURING METHOD FOR THIN FILM LITHIUM SECONDARY BATTERY, AND THIN FILM LITHIUM SECONDARY BATTERY

A thin film lithium secondary battery (10) manufacturing method comprises: a positive electrode active material layer formation step for forming a positive electrode active material layer (13) on a substrate (11); an electrolyte layer formation step for forming an electrolyte layer (14) on the positive electrode active material layer (13); a negative electrode active material layer formation step for forming a negative electrode active material layer (16) on the electrolyte layer (14); and a laser annealing step for irradiating a laser light on at least one non-crystalline layer among the positive electrode active material layer (13), the electrolyte layer (14), and the negative electrode active material layer (16), and modifying the non-crystalline layer such that the layer is crystalline or in a crystalline-precursor state.