A liquid crystal panel included in a scanning antenna includes: a TFT substrate including a first dielectric substrate, a TFT supported on the first dielectric substrate, a gate bus line, a source bus line, a patch electrode, and a first alignment film covering the patch electrode; a slot substrate including a second dielectric substrate, a slot electrode formed on a first main surface of the second dielectric substrate and including a slot arranged corresponding to the patch electrode, and a second alignment film covering the slot electrode; and a liquid crystal layer provided between the TFT substrate and the slot substrate and containing a liquid crystal molecule having an isothiocyanate group. The patch electrodes and the slot electrode are each formed of a Cu layer or an Al layer, and the first alignment film and the second alignment film each include a compound having an atomic group forming a coordinate bond with Cu or Al.