A contactless power transmission device, by which power is to be transmitted to a power reception device in a contactless manner, the contactless power transmission device comprising: a shield case which has an opening portion at one end portion thereof and is configured for the power reception device to be inserted thereinto through the opening portion; a power transmission circuit which is for transmitting power and is disposed in the shield case; a power transmission coil which is disposed on the inner side in the shield case when viewed from the opening portion, and transmits AC power from the power transmission circuit to the power reception device; characterized in that: the shield case has a notch which is formed on side surfaces of the shield case, from edges of the opening portion toward the inner side such that both sides of a rear end portion of the power reception device in an insertion direction is positioned further on the inner side than the opening portion and a part of the rear end portion is exposed through the notch, for allowing the power reception device to be easily extracted from the shield case by the rear end portion being held by fingers from both sides of the notch; and the power transmission coil faces the opening portion and is disposed so as to be orthogonal to an insertion direction of the power reception device. a shield case which has an opening portion at one end portion thereof and is configured for the power reception device to be inserted thereinto through the opening portion; a power transmission circuit which is for transmitting power and is disposed in the shield case; a power transmission coil which is disposed on the inner side in the shield case when viewed from the opening portion, and transmits AC power from the power transmission circuit to the power reception device; characterized in that: the shield case has a notch which is formed on side surfaces of the shield case, from edges of the opening portion toward the inner side such that both sides of a rear end portion of the power reception device in an insertion direction is positioned further on the inner side than the opening portion and a part of the rear end portion is exposed through the notch, for allowing the power reception device to be easily extracted from the shield case by the rear end portion being held by fingers from both sides of the notch; and the power transmission coil faces the opening portion and is disposed so as to be orthogonal to an insertion direction of the power reception device. the shield case has a notch which is formed on side surfaces of the shield case, from edges of the opening portion toward the inner side such that both sides of a rear end portion of the power reception device in an insertion direction is positioned further on the inner side than the opening portion and a part of the rear end portion is exposed through the notch, for allowing the power reception device to be easily extracted from the shield case by the rear end portion being held by fingers from both sides of the notch; and the power transmission coil faces the opening portion and is disposed so as to be orthogonal to an insertion direction of the power reception device.