To provide a speech volume control circuit capable of automatically adjusting sound volume of a receiver with a simplified structure.

A DC voltage according to a level of a call transmission signal St is outputted by a detecting diode by a call transmission level detecting part 11. A signal level is outputted as four-bit parallel data obtained by dividing the signal level into four ranks based on the DC voltage by an A-D converting part 12. Plural (four) switch elements are operated according to parallel data by a switching part 13. A gain is varied according to resistance values of resistors R1 to R4 for feedback selected by the switch element of the switching part 13 by a variable gain amplification part 14. In this case, the gain of the variable gain amplification part 14 is controlled to become higher as the signal level of the call transmission signal St becomes larger.