Having tsuma, or a gable pediment, at each end of the roof, is a feature of kirizuma-zukuri, or gable style, which is the dominant style of shrine architecture with the other style being irimoya-zukuri, a gabled hipped roof style.
まず「屋根に妻を持つこと」についてだが、これは神社建築の屋根はほとんどが切妻造で、一部に入母屋造が見られる。