PROBLEM TO BE SOLVED: To provide a mammography apparatus capable of lessening an impact on the accuracy of interior information due to differences in shapes or sizes of a breast.SOLUTION: A mammography apparatus 1 for illuminating the breast B of a subject A with light, and acquires information of the interior of the breast B by detecting diffuse light, includes a container 3 surrounding the breast B, and a plurality of optical fibers 11 attached toward the inner side of the container 3 and carrying out illumination and detection of the light. The container 3 includes a base member 30 having an opening 30a, a plurality of ring-shaped members 40 communicating with the opening 30a and positioned in series, and a bottom part member 50 positioned on the inner side of the ring-shaped member 40 the furthest from the base member 30. Each ring-shaped member 40 and the bottom part member 50 are configured to be relatively displaceable in the communication direction of either the ring-shaped member 40 adjacent to the base member 30 side or the base member 30. At least part of the plurality of the optical fibers 11 are attached to the plurality of the ring-shaped members 40.【課題】乳房の形状や大きさの違いによる内部情報の精度への影響を小さくすることができる乳房撮像装置を提供する。【解決手段】乳房撮像装置１は、被検者Ａの乳房Ｂに光を照射し、拡散光を検出することにより乳房Ｂの内部情報を取得する装置であって、乳房Ｂを囲む容器３と、容器３の内側へ向けて取り付けられ、光の照射及び検出を行う複数の光ファイバ１１とを備える。容器３は、開口３０ａを有するベース部材３０と、開口３０ａと連通して連続配置された複数の環状部材４０と、ベース部材３０から最も離れた環状部材４０の内側に配置された底部部材５０とを有する。各環状部材４０及び底部部材５０は、ベース部材３０側に隣接する環状部材４０若しくはベース部材３０に対して相対的に連通方向に変位可能に構成されている。複数の光ファイバ１１の少なくとも一部は、複数の環状部材４０に取り付けられている。【選択図】図４
