The invention provides an orientation detection marker having a simple structure and capable of providing information enabling the remote measurement of the orientation of a controller. Light source unit 13 (orientation detection marker) provides so-called biaxial direction information composed of one axis on which dotted light sources 131 to 133 are disposed at equal intervals and another axis on which dotted light sources 131, 134 and 135 are disposed at the same interval as the above intervals and which intersects with the aforementioned one axis at the dotted light source 131 or the like.