A battery spacer comprising: a battery storage part having a bottomed cylindrical shape in which a battery is stored; a lid part which closes an opening of the battery storage part; and a positive electrode relay terminal which is provided to the lid part, a part of which protrudes from a top surface of the lid part, and which abuts on a positive electrode terminal of the battery in the battery storage part, and a negative electrode relay terminal which is provided on a bottom section of the battery storage part, a part of which is exposed from an outer bottom surface of the battery storage part, and which abuts on a negative electrode terminal of the battery in the battery storage part, wherein the lid part has a protruding section formed which protrudes further toward the battery side than a surface of the positive electrode relay terminal to abut on the positive electrode terminal of the battery, the protruding section has a protruding length, in an axial direction of the battery, from the surface of the positive electrode relay terminal to abut on the positive electrode terminal of the battery, shorter than a length of the positive electrode terminal of the battery, and is formed in a range outside the positive electrode terminal of the battery but inside an outer circumferential surface of the battery in a radial direction of the battery, the battery storage part has a recess section formed in the outer bottom surface, the part of the negative electrode relay terminal exposed from the outer bottom surface of the battery storage part is located in the recess section, the negative electrode relay terminal comprises a plate member including a circular disc section and two band-like sections extending radially outward from both sides of the disc section bent so as to enclose the bottom section of the battery storage part but not to come into complete contact with an inner bottom surface of the bottom section to form an empty gap between the inner bottom surface and lower surfaces of the band-like sections such that the band-like sections are movable towards the bottom section in a resilient manner, and the part of the negative electrode relay terminal exposed from the outer bottom surface is located at a position retracted from a lowermost surface of the outer bottom surface of the battery storage part. a battery storage part having a bottomed cylindrical shape in which a battery is stored; a lid part which closes an opening of the battery storage part; and a positive electrode relay terminal which is provided to the lid part, a part of which protrudes from a top surface of the lid part, and which abuts on a positive electrode terminal of the battery in the battery storage part, and a negative electrode relay terminal which is provided on a bottom section of the battery storage part, a part of which is exposed from an outer bottom surface of the battery storage part, and which abuts on a negative electrode terminal of the battery in the battery storage part, wherein the lid part has a protruding section formed which protrudes further toward the battery side than a surface of the positive electrode relay terminal to abut on the positive electrode terminal of the battery, the protruding section has a protruding length, in an axial direction of the battery, from the surface of the positive electrode relay terminal to abut on the positive electrode terminal of the battery, shorter than a length of the positive electrode terminal of the battery, and is formed in a range outside the positive electrode terminal of the battery but inside an outer circumferential surface of the battery in a radial direction of the battery, the battery storage part has a recess section formed in the outer bottom surface, the part of the negative electrode relay terminal exposed from the outer bottom surface of the battery storage part is located in the recess section, the negative electrode relay terminal comprises a plate member including a circular disc section and two band-like sections extending radially outward from both sides of the disc section bent so as to enclose the bottom section of the battery storage part but not to come into complete contact with an inner bottom surface of the bottom section to form an empty gap between the inner bottom surface and lower surfaces of the band-like sections such that the band-like sections are movable towards the bottom section in a resilient manner, and the part of the negative electrode relay terminal exposed from the outer bottom surface is located at a position retracted from a lowermost surface of the outer bottom surface of the battery storage part.