A wireless communication device for performing wireless communication, comprising: a reception controller for performing a process of receiving a pilot signal transmitted from a base station and measuring a propagation environment to obtain a propagation environment value, and a process of detecting an amount of phase change of the pilot signal; a moving average processor for obtaining a moving average of a plurality of propagation environment values successively measured by the reception controller; a propagation environment index function setter for setting a propagation environment index function indicative of a correspondence relationship between the propagation environment value and a propagation environment index which is a quality index of the propagation environment; a slope corrector correcting a slope of the propagation environment index function by using the moving average as a reference point; and a propagation environment index transmitter for obtaining a propagation environment index corresponding to the measured propagation environment value, and transmitting the obtained propagation environment index to the base station, wherein the slope corrector compares the amount of phase change of the pilot signal detected by the reception controller with a threshold and, when the detected amount of phase change is judged to be greater than the threshold, corrects the slope of the propagation environment index function by using the moving average as the reference point such that dispersion of the propagation environment index is restrained, and wherein the propagation environment index transmitter obtains the propagation environment index corresponding to the measured propagation environment value by using the propagation environment index function of which the slope has been corrected. a reception controller for performing a process of receiving a pilot signal transmitted from a base station and measuring a propagation environment to obtain a propagation environment value, and a process of detecting an amount of phase change of the pilot signal; a moving average processor for obtaining a moving average of a plurality of propagation environment values successively measured by the reception controller; a propagation environment index function setter for setting a propagation environment index function indicative of a correspondence relationship between the propagation environment value and a propagation environment index which is a quality index of the propagation environment; a slope corrector correcting a slope of the propagation environment index function by using the moving average as a reference point; and a propagation environment index transmitter for obtaining a propagation environment index corresponding to the measured propagation environment value, and transmitting the obtained propagation environment index to the base station, wherein the slope corrector compares the amount of phase change of the pilot signal detected by the reception controller with a threshold and, when the detected amount of phase change is judged to be greater than the threshold, corrects the slope of the propagation environment index function by using the moving average as the reference point such that dispersion of the propagation environment index is restrained, and wherein the propagation environment index transmitter obtains the propagation environment index corresponding to the measured propagation environment value by using the propagation environment index function of which the slope has been corrected.