The origin of cosmic rays – high-energy radiation (atomic nuclei) from space – still remains to be a mystery to us, even though they were discovered more than a century ago. In order to know where galactic cosmic rays come from, the observation of cosmic gamma rays in the energy range from 10 TeV to 1000 TeV is very important. The ALPACA experiment will be a unique experiment in the southern sky to observe such gamma rays with a wide field of view. In this seminar, the description of the ALPACA observatory and the expected results will be reported, along with other interesting astrophysical research subjects.