A temperature estimation device for a contactless power reception device, the temperature estimation device estimating an ambient temperature of a power reception coil of the power reception device that contactless receives a power transmitted from a power transmission coil via the power reception coil, the temperature estimation device comprising: a power transmission-side power loss acquisition unit which acquires a power loss of the power transmission coil; characterized by further comprising: a positional shift amount acquisition unit which acquires a gap between the power transmission coil and the power reception coil and a planar positional shift amount between the power transmission coil and the power reception coil, and determines a correction coefficient on a basis of the gap and the planar positional shift amount; and a temperature estimation unit which estimates the ambient temperature of the power reception coil on a basis of a preset amount of heat generation of the power reception device and the power loss of the power transmission coil, wherein when a positional relationship between the power transmission coil and the power reception coil is shifted from a normal positional relationship, the temperature estimation unit changes a contribution to a temperature rise due to the power loss of the power transmission coil by multiplying the power loss of the power transmission coil by the correction coefficient. a power transmission-side power loss acquisition unit which acquires a power loss of the power transmission coil; characterized by further comprising: a positional shift amount acquisition unit which acquires a gap between the power transmission coil and the power reception coil and a planar positional shift amount between the power transmission coil and the power reception coil, and determines a correction coefficient on a basis of the gap and the planar positional shift amount; and a temperature estimation unit which estimates the ambient temperature of the power reception coil on a basis of a preset amount of heat generation of the power reception device and the power loss of the power transmission coil, wherein when a positional relationship between the power transmission coil and the power reception coil is shifted from a normal positional relationship, the temperature estimation unit changes a contribution to a temperature rise due to the power loss of the power transmission coil by multiplying the power loss of the power transmission coil by the correction coefficient. a positional shift amount acquisition unit which acquires a gap between the power transmission coil and the power reception coil and a planar positional shift amount between the power transmission coil and the power reception coil, and determines a correction coefficient on a basis of the gap and the planar positional shift amount; and a temperature estimation unit which estimates the ambient temperature of the power reception coil on a basis of a preset amount of heat generation of the power reception device and the power loss of the power transmission coil, wherein when a positional relationship between the power transmission coil and the power reception coil is shifted from a normal positional relationship, the temperature estimation unit changes a contribution to a temperature rise due to the power loss of the power transmission coil by multiplying the power loss of the power transmission coil by the correction coefficient.