Although regularly curved stone axes also appeared with the stone axes based on the technique for cutting by rubbing, it is in the end of the middle Jomon period that these stone axes had regular shape with wide diffusion and a large amount of excavation.
擦切技法の石斧とともに定角式磨製石斧も現れるが、この石斧が定型的な形を持ち、広い分布と出土量の多さを示してくるのは縄文中期末頃である。