The pulse measuring element of the present disclosure includes a housing (19), a light emitting element (11), a light receiving element (13), a first end face (12A) facing the light emitting element (11), and a first end face ( 12A) and the second end face (12B) facing the light receiving element (13), one or a plurality of first side faces covered with the casing (19), and 1 exposed from the casing (19) Or the light guide (12) which has several 2nd side surfaces (S) is provided.本開示の脈拍計測素子は、筺体（１９）と、発光素子（１１）と、受光素子（１３）と、発光素子（１１）と対向する第１の端面（１２Ａ）と、第１の端面（１２Ａ）と対向するとともに受光素子（１３）と対向する第２の端面（１２Ｂ）と、筺体（１９）に覆われた１または複数の第１の側面と、筺体（１９）から露出された１または複数の第２の側面（Ｓ）とを有する導光体（１２）とを備える。
