We present weak-lensing measurements using the first-year data from the Hyper<br />
Suprime-Cam Strategic Survey Program on the Subaru telescope for eight galaxy<br />
clusters selected through their thermal Sunyaev-Zel&#039;dovich (SZ) signal measured<br />
at 148 GHz with the Atacama Cosmology Telescope Polarimeter experiment. The<br />
overlap between the two surveys in this work is 33.8 square degrees, before<br />
masking bright stars. The signal-to-noise ratio of individual cluster lensing<br />
measurements ranges from 2.2 to 8.7, with a total of 11.1 for the stacked<br />
cluster weak-lensing signal. We fit for an average weak-lensing mass<br />
distribution using three different profiles, a Navarro-Frenk-White profile, a<br />
dark-matter-only emulated profile, and a full cosmological hydrodynamic<br />
emulated profile. We interpret the differences among the masses inferred by<br />
these models as a systematic error of 10\%, which is currently smaller than the<br />
statistical error. We obtain the ratio of the SZ-estimated mass to the<br />
lensing-estimated mass (the so-called hydrostatic mass bias $1-b$) of<br />
$0.74^{+0.13}_{-0.12}$, which is comparable to previous SZ-selected clusters<br />
from the Atacama Cosmology Telescope and from the {\sl Planck} Satellite. We<br />
conclude with a discussion of the implications for cosmological parameters<br />
inferred from cluster abundances compared to cosmic microwave background<br />
primary anisotropy measurements.