  We report our study of two proto-brown dwarf candidates in Taurus, [GKH94]~41
and IRAS~04191+1523B. Based on continuum maps at 102~GHz (or 2.9~mm), spectral
types and the spectral energy distribution of both targets, we confirmed the
class I evolutionary stage of [GKH94]~41 and IRAS~04191+1523B, and estimated
the upper limit to the final masses to be 49$^{+56}_{-27}$~$M_{\rm J}$ and
75$^{+40}_{-26}$~$M_{\rm J}$ for [GKH94]~41 and IRAS~04191+1523B, respectively.
This indicates that they will likely end up as brown dwarfs or very low-mass
stars. The existence of these class I very low-mass objects strongly supports
the scenario that brown dwarfs and very low-mass stars have the same formation
stages as low-mass stars.
