[Problem] To prevent urine from causing a short circuit in an electrocardiographic sensing board used to measure the electrical activity of the heart of a mouse. [Solution] This electrocardiographic sensing board 11 is used to measure the electrical activity of the heart of a mouse. The electrocardiographic sensing board 11 comprises a board 11 and a plurality of parallel electrode patterns P1-P15 formed on one surface of the board and having exposed surfaces. Between adjacent electrode patterns, urination slits 114 are formed in the board 11 that are parallel to the electrode patterns.
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