An informing apparatus for a mobile communication apparatus is provided, which can be used in a silent mode without a limitation in resonance frequency. An informing apparatus 1 is constituted in such a manner that two magnetic gaps A, B are formed in a magnetic circuit of internal magnet type or external magnet type, voice coils 8, 11 are set in magnetic gaps A, B, respectively, a first vibrant part includes one voice coil 8 connected to a diaphragm 10, and that a second vibrant part includes another voice coil 11 connected, via supporters 12, 13, to a casing 14 set outside the magnetic circuit, said supporters and said magnetic circuit, wherein a sound receiving function and/or a call-tone receiving function, which is performed with a sound signal and/or a call-tone signal sent to the voice coil 8 in the first vibrant part, and a silent mode call-reception informing function, which is performed with a call-reception signal sent to the voice coil 11 in the second vibrant part whereby the supporters and the magnetic circuit are vibrated thereby making the mobile communication apparatus itself resonate, work independently.