The invention relates to a process for manufacturing plasma display panel and a substrate holder, preventing an occurrence of dust giving an unfavorable effect in a forming process of a film on a substrate of a plasma display panel in a film forming apparatus. When forming the film, a substrate (3) and a dummy substrate (35) are held by a first substrate holder (31) composed of a supporter sustaining underneath the substrate and a restrictor restricting a position of the substrates (3) in a plane direction, and a second substrate holder (32) sustaining the first substrate holder (31).