Quasiparticle energy dispersions in the vortex state of pure type-II s
uperconductors are studied theoretically near H(c2), taking account of
the orbital quantization due to a magnetic field. We find that the di
spersions have a small gap at integer multiples of cyclotron frequency
. It is shown that the quasiparticle is composed of a pair of an elect
ron and a hole quantized in Landau levels.