Sensor element

A sensor element, comprising:

• a spherical base;
• a temperature-sensitive film formed on an entire surface of the spherical base and having an electric resistance value that changes due to a change in temperature;
• and
• a wiring member connected to opposing ends of the temperature-sensitive film,
• wherein the temperature-sensitive film includes connection regions connected to the wiring member and a pattern defined by recessed lines formed in the temperature-sensitive film,
• wherein the pattern extends from each of the connection regions toward a center of the spherical base,
• wherein a cross-sectional area of each section of the pattern that borders the connection regions is formed smaller than a section of the pattern at the center of the spherical base,
• wherein each section of the pattern is defined between adjacent recessed lines, and
• wherein the section of the pattern at the center of the spherical base is wider than each section of the pattern that borders the connection regions.