An SIR measuring apparatus capable of measuring an SIR after interference cancellation with a high degree of accuracy in a short time after its reception without performing JD demodulation. This apparatus creates a delay profile using midamble sections and measures the SIR using this delay profile and estimated path positions. That is, the signal power measuring section (142) measures signal power from the delay profile and the positions of the selected paths and the interference power measuring section (144) measures interference power from the delay profile and the positions of the selected paths. Then, the signal power correction section (146) and interference power correction section (148) perform necessary corrections and the SIR calculation section (150) calculates the SIR according to predetermined calculation formulas.