PROBLEM TO BE SOLVED: To provide a mirror part and a dental mirror that are able to easily expand an operation field to enable a treatment to be performed easily, such as making water absorption easy, without causing inconveniences such as giving discomfort or pain, during excluding cheek mucosa, etc. in an oral cavity.SOLUTION: In a mirror part 10 used for a dental mirror D, a surface f on the opposite side of a mirror 1 of a mirror holding part 2 that holds the mirror 1 is swollen in a curved shape.COPYRIGHT: (C)2015,JPO&INPIT【課題】口腔内での頬粘膜等の圧排時に不快感や痛みを与えるような不都合を発生させることなく術野を容易に広く拡げることができ、吸水を楽にできる等治療を行い易くできるミラー部及びデンタルミラーを提供すること。【解決手段】デンタルミラーDに用いられるミラー部10において、ミラー1を保持するミラー保持部2のミラー1とは反対側の面fを曲面状に膨出させてある。【選択図】 図3