  Measurement of cosmic-ray proton, antiproton and muon spectra was carried out
at mountain altitude. We observed 2 x 10^5 protons and 10^2 antiprotons in a
kinetic energy region of 0.25 -- 3.3 GeV. Zenith-angle dependence of proton
fluxes was obtained. Atmospheric muon spectra were measured simultaneously. The
observed antiproton spectrum showed some deviation from theoretical predictions
particularly in a low energy region.
