Due to the nature depending on only the gravitational field , microlensing , in principle , provides an important tool to detect faint and even dark brown dwarfs .
However , the number of identified brown dwarfs is limited due to the difficulty of the lens mass measurement that is needed to check the substellar nature of the lensing object .
In this work , we report a microlensing brown dwarf discovered from the analysis of the gravitational binary-lens event OGLE-2014-BLG-1112 .
We identify the brown-dwarf nature of the lens companion by measuring the lens mass from the detections of both microlens-parallax and finite-source effects .
We find that the companion has a mass of ( 3.03 \pm 0.78 ) \times 10 ^ { -2 } M _ { \odot } and it is orbiting a solar-type primary star with a mass of 1.07 \pm 0.28 M _ { \odot } .
The estimated projected separation between the lens components is 9.63 \pm 1.33 au and the distance to the lens is 4.84 \pm 0.67 kpc .
We discuss the usefulness of space-based microlensing observations in detecting brown dwarfs through the channel of binary-lens events .