A micro-resonator of a single structure which outputs signals of two resonance frequencies of mutually opposite phases and in which different resonance frequencies are adjusted independently is provided. The micro-resonator includes: an oscillation portion 6 sustained with a gap by support portions 8 [8A, 8B] and an input electrode 3 and an output electrode 4 that become lower electrodes facing the oscillation portion 6 across the gap, in which the input electrode 3 and the output electrode 4 are disposed to face each other along a line intersecting the oscillation portion 6, the oscillation portion 6 generates torsional oscillation and flexural oscillation, and output signals of two resonance frequencies close to each other based on different resonance modes have mutually different phases by 180.degree..