A radio communication apparatus (1, 2) which employs adaptive modulation control for changing a modulation scheme according to a state of a transmission path and automatic transmitter power control for changing a transmission level according to a reception level for conducting radio communication with another radio communication apparatus by a continuous signal transmission scheme, comprising: control means (MOD CONT1, MOD CONT2) adapted to stop the automatic transmitter power control in a situation (1-Figure 4) in which the reception level is lowered and has reached an automatic transmitter power control threshold value which corresponds to a maximum value of the transmission level under a first modulation scheme currently being used; and adapted to conduct the adaptive modulation control, in a situation (2-Figure 4) in which the reception level is lowered and has reached a modulation scheme changeover threshold value, for a changeover from the first modulation scheme to a second modulation scheme which has a lower transmission capacity but a higher system gain compared with the first modulation scheme, and to heighten the transmission level at a predetermined value corresponding to a maximum transmission level difference restricted for each of the first modulation scheme and the second modulation scheme, and to fix the heightened transmission level during a period (C-Figure 4) of the transmission in the second modulation scheme without performing the automatic transmitter power control; and adapted to conduct transmission level reduction control to lower the transmission level stepwise by a predetermined value corresponding to the system gain difference between the first modulation scheme and the second modulation scheme (D-Figure 4) before resetting is conducted from the second modulation scheme to the first modulation scheme, in a situation in which the reception level is heightened and has reached the automatic transmitter power control threshold value. control means (MOD CONT1, MOD CONT2) adapted to stop the automatic transmitter power control in a situation (1-Figure 4) in which the reception level is lowered and has reached an automatic transmitter power control threshold value which corresponds to a maximum value of the transmission level under a first modulation scheme currently being used; and adapted to conduct the adaptive modulation control, in a situation (2-Figure 4) in which the reception level is lowered and has reached a modulation scheme changeover threshold value, for a changeover from the first modulation scheme to a second modulation scheme which has a lower transmission capacity but a higher system gain compared with the first modulation scheme, and to heighten the transmission level at a predetermined value corresponding to a maximum transmission level difference restricted for each of the first modulation scheme and the second modulation scheme, and to fix the heightened transmission level during a period (C-Figure 4) of the transmission in the second modulation scheme without performing the automatic transmitter power control; and adapted to conduct transmission level reduction control to lower the transmission level stepwise by a predetermined value corresponding to the system gain difference between the first modulation scheme and the second modulation scheme (D-Figure 4) before resetting is conducted from the second modulation scheme to the first modulation scheme, in a situation in which the reception level is heightened and has reached the automatic transmitter power control threshold value.