PROBLEM TO BE SOLVED: To provide a package for a measurement sensor and a measurement sensor capable of accurately measuring a blood flow of a blood vessel in a deep position of a living body.SOLUTION: A package 1 for a measurement sensor includes a substrate 2 and a lid body for covering one surface 21 of the substrate. The one surface of the substrate is provided with a light emitting element storage concave part 20a for storing a light emitting element, a first light receiving element storage concave part 20b for storing a first light receiving element, and a second light receiving element storage concave part 20c for storing a second light receiving element. The distance from the light emitting element storage concave part is longer in the second light receiving element storage concave part than in the first light receiving element storage concave part, and the depth from the one surface of the substrate is shallower in the second light receiving element storage concave part than in the first light receiving element storage concave part.SELECTED DRAWING: Figure 1【課題】生体内の深い位置にある血管の血流を高精度で測定することができる計測センサ用パッケージおよび計測センサを提供する。【解決手段】計測センサ用パッケージ１は、基体２と、基体の１つの面２１を覆う蓋体とを備え、基体の１つの面には、発光素子を収容する発光素子収容凹部２０ａ、第１受光素子を収容する第１受光素子収容凹部２０ｂおよび第２受光素子を収容する第２受光素子収容凹部２０ｃが設けられ、発光素子収容凹部からの距離が、第２受光素子収容凹部の方が、第１受光素子収容凹部よりも遠く、基体の１つの面からの深さが、第２受光素子収容凹部の方が、第１受光素子収容凹部よりも浅い。【選択図】図１
