A speech encoding apparatus comprising: an LPC analysis section configured to perform linear predictive analysis on an input speech signal and output an obtained linear predictive coefficient; an LPC encoding section configured to quantize and encode the linear predictive coefficient, and to output an obtained quantized linear predictive coefficient and an encoded LPC parameter; an LPC synthesis filter section configured to drive an LPC synthesis filter by means of the excitation signal and using the quantized linear predictive coefficient output from the LPC encoding section; an excitation generation section adapted to output an excitation signal for which coding distortion is at minimum and excitation parameters including a random codebook index, a random codebook gain, a pitch lag, and a pitch gain; an excitation power calculation section configured to calculate power of the excitation signal; an excitation parameter encoding section configured to encode the random codebook index, the random codebook gain, the pitch lag, and the pitch gain output by the excitation generation section, and to output an obtained encoded excitation parameter; and a pitch pulse detection section configured to detect a pitch pulse of the excitation signal, and to output a pitch pulse amplitude and an encoded pitch pulse position; a normalized predicted residual power calculation section configured to calculate a normalized predicted residual power from the linear predictive coefficient output from the LPC analysis section; a power parameter encoding section configured to encode the calculated excitation power, normalized prediction residual power, and the pitch pulse amplitude to obtain encoded power parameters, and to output the encoded power parameters as encoded concealment processing parameters; and a multiplexing section configured to multiplex the encoded concealment processing parameters with another parameter, wherein the multiplexing section multiplexes at least a frame n encoded LPC parameter output from the LPC encoding section, a frame n encoded excitation parameter output from excitation parameter encoding section, a frame n-1 encoded pitch pulse position parameter output from pitch pulse extraction section, and frame n-1 encoded power parameters output from the power parameter encoding section, and outputs the obtained multiplexed data as frame n encoded speech data, wherein n is an integer greater than 0 that denotes the frame number of an input speech signal, and wherein the normalized predicted residual power Pz(n) of a frame n is calculated by Pz n = ∏ j = 1 M 1 − r j 2, where M is a prediction order and r[j] is a j-th order reflection coefficient. an LPC analysis section configured to perform linear predictive analysis on an input speech signal and output an obtained linear predictive coefficient; an LPC encoding section configured to quantize and encode the linear predictive coefficient, and to output an obtained quantized linear predictive coefficient and an encoded LPC parameter; an LPC synthesis filter section configured to drive an LPC synthesis filter by means of the excitation signal and using the quantized linear predictive coefficient output from the LPC encoding section; an excitation generation section adapted to output an excitation signal for which coding distortion is at minimum and excitation parameters including a random codebook index, a random codebook gain, a pitch lag, and a pitch gain; an excitation power calculation section configured to calculate power of the excitation signal; an excitation parameter encoding section configured to encode the random codebook index, the random codebook gain, the pitch lag, and the pitch gain output by the excitation generation section, and to output an obtained encoded excitation parameter; and a pitch pulse detection section configured to detect a pitch pulse of the excitation signal, and to output a pitch pulse amplitude and an encoded pitch pulse position; a normalized predicted residual power calculation section configured to calculate a normalized predicted residual power from the linear predictive coefficient output from the LPC analysis section; a power parameter encoding section configured to encode the calculated excitation power, normalized prediction residual power, and the pitch pulse amplitude to obtain encoded power parameters, and to output the encoded power parameters as encoded concealment processing parameters; and a multiplexing section configured to multiplex the encoded concealment processing parameters with another parameter, wherein the multiplexing section multiplexes at least a frame n encoded LPC parameter output from the LPC encoding section, a frame n encoded excitation parameter output from excitation parameter encoding section, a frame n-1 encoded pitch pulse position parameter output from pitch pulse extraction section, and frame n-1 encoded power parameters output from the power parameter encoding section, and outputs the obtained multiplexed data as frame n encoded speech data, wherein n is an integer greater than 0 that denotes the frame number of an input speech signal, and wherein the normalized predicted residual power Pz(n) of a frame n is calculated by Pz n = ∏ j = 1 M 1 − r j 2, where M is a prediction order and r[j] is a j-th order reflection coefficient.