Thin film capacitor

A thin film capacitor comprising

• a lower electrode layer, an upper electrode layer, and a dielectric substance layer provided between the lower electrode layer and the upper electrode layer, wherein
• a dielectric patch member is formed on a surface of the dielectric substance layer on an upper electrode layer side,
• the dielectric patch member is formed of a dielectric material,
• a cross-sectional structure of the dielectric patch member has a taper angle of 1 degree to 25 degrees in a cross section perpendicular to the dielectric substance layer, the taper angle being an angle formed by (1) a tangential line tangent to an end portion of the dielectric patch member at a position that is 50% of a maximum height of the dielectric patch member and (2) a line being an interface between the dielectric substance layer and the upper electrode layer, and
• an area of the dielectric patch member is 100 μm2 or more and 900000 μm2 or less.