 T2K is a successor of the KEK to Kamioka (K2K) experiment, which ran from 1999 till 2004.In the K2K experiment, an accelerator beam of muon neutrinos was produced at KEK facility in Tsukuba (Japan) and sent towards the Super-Kamiokande detector, located 250 km away.The K2K experiment results confirmed at the confidence level of 99.9985% (4.3 σ) the disappearance of the muon neutrinos and were consistent with the previous measurements of oscillation parameters measured by the Super-Kamiokande detector for atmospheric neutrinos.