Audio device and portable device

An audio device comprising:

• a left speaker disposed on a left side of a portable device when viewed from a user, the portable device being configured to be used in a handheld state by the user, and the left speaker being configured to output sound toward the user;
• a right speaker disposed on a right side of the portable device when viewed from the user, the right speaker being configured to output sound toward the user;
• a rear center speaker disposed at a central position of the portable device when viewed from the user, the rear center speaker being configured to output sound in a direction opposite to the user;
• a pseudo surround signal generator configured to generate, from target audio signals being left and right two-channel audio signals, a left channel audio signal, a right channel audio signal, and a center channel audio signal representing a component correlated between the left and right two-channel audio signals;
• and
• a reverb effect imparting unit configured to impart a reverb effect to the center channel audio signal, and to generate a rear center channel audio signal from the center channel audio signal to which the reverb effect is imparted, wherein:
• the left speaker is configured to output the left channel audio signal;
• the right speaker is configured to output the right channel audio signal;
• and
• the rear center speaker is configured to output the rear center channel audio signal.