I have participated in the POLARBEAR experiment, which is a cosmic microwave background (CMB) polarization measurement at the Atacama Desert in Chile. My main work is mitigation of low-frequency noise, which is very important to observe inflationary B-modes. I have developed a polarization modulator using a continuously rotating half-wave plate and started large patch observations using it. I will continue Simons Array, an upgrade of POLARBEAR, and also collaborate with people developing a polarization modulator for LiteBIRD at the Kavli IPMU.