Directional information should play a significant role
for a firm detection of the galactic dark matter.
We developed a prototype three-dimensional gaseous tracking device
for a direction-sensitive dark matter direct detection.
We investigated the performance of the prototype detector and demonstrated
a direction-sensitive dark matter search experiment in a
surface laboratory.
We set the first limit
on the spin-dependent WIMP (Weakly Interacting Massive Particles)-proton cross s
ection by a direction-sensitive method.