  We study the prospects for measuring the dark matter distribution of voids
with stacked weak lensing. We select voids from a large set of $N$-body
simulations, and explore their lensing signals with the full ray-tracing
simulations including the effect of the large-scale structure along the
line-of-sight. The lensing signals are compared with simple void model
predictions to infer the three-dimensional mass distribution of voids. We show
that the stacked weak lensing signals are detected at significant level
(S/N$\geq5$) for a 5000 degree$^2$ survey area, for a wide range of void radii
up to $\sim50$ Mpc. The error from the galaxy shape noise little affects
lensing signals at large scale. It is also found that dense ridges around voids
have a great impact on the weak lensing signals, suggesting that proper
modeling of the void density profile including surrounding ridges is essential
for extracting the average total underdens mass of voids.
