To provide a portable telephone set capable of automatically setting various functions including a received sound volume adjustment function without needing a large memory size.

When this portable telephone set 1 is respectively located within the cell range of a public base station, the set 1 registers the base station identification number of the public base station and information in the set value at that time in a storing part 14 by setting respective received sound volumes in the cell range of the public base station, the lighting of a backlight or an LCD and the use (hereafter, automatic telephone recording mode) of an automatic answering telephone set by the operation of a user. In the case a base station identification number is previously registered when the base station identification number is acquired, a control part 13 sets a received sound volume, the lighting of the backlight or a LED and the automatic telephone recording mode according to the set contents stored in the part 14 by respectively controlling a voice codec part 15, a displaying part 19 and the part 14.