Precise measurements of cosmic microwave background (CMB) polarization, especially its odd-parity patterns (B-modes) at large angular scale, prove a scenario of inflationary universe. Many experiments are aiming to detect them. High Energy Accelerator Research Organization (KEK) have joined the race for the B-modes search from 2007; we have started our activity with the QUIET collaboration. Our goal is measurements of the B-modes "spectrum", especially both ionization bump and the first peak. Satellite mission and the ground based experiments toward it allow such measurements. In this talk, I will show the achievements of QUIET which used similar instrumental technique as QUIJOTE. I will also introduce other activities towards our goal.