A mobile robot comprising: a mobile main body; and a pattern irradiation unit arranged to emit an optical pattern, including a first pattern comprising a line extending in a first direction and a second pattern comprising a line extending in a second direction intersecting the first pattern, to a region around the main body, wherein the pattern irradiation unit includes: a light source arranged to emit light; and a lens arranged to convert the light emitted from the light source into the optical pattern, wherein the lens includes convex cells on an incidence surface upon which light emitted from the light source is arranged to be incident, the incidence surface is divided into a first area arranged to convert the light emitted from the light source into the first pattern and a second area arranged to convert the light emitted from the light source into the second pattern, wherein a first plurality of first convex cells, wherein the first plurality extends in a direction orthogonal to the first direction, are formed in parallel in the first area and a second plurality of second convex cells, wherein the second plurality extends in a direction orthogonal to the second direction, are formed in parallel in the second area. a mobile main body; and a pattern irradiation unit arranged to emit an optical pattern, including a first pattern comprising a line extending in a first direction and a second pattern comprising a line extending in a second direction intersecting the first pattern, to a region around the main body, wherein the pattern irradiation unit includes: a light source arranged to emit light; and a lens arranged to convert the light emitted from the light source into the optical pattern, wherein the lens includes convex cells on an incidence surface upon which light emitted from the light source is arranged to be incident, the incidence surface is divided into a first area arranged to convert the light emitted from the light source into the first pattern and a second area arranged to convert the light emitted from the light source into the second pattern, wherein a first plurality of first convex cells, wherein the first plurality extends in a direction orthogonal to the first direction, are formed in parallel in the first area and a second plurality of second convex cells, wherein the second plurality extends in a direction orthogonal to the second direction, are formed in parallel in the second area. a light source arranged to emit light; and a lens arranged to convert the light emitted from the light source into the optical pattern, wherein the lens includes convex cells on an incidence surface upon which light emitted from the light source is arranged to be incident, the incidence surface is divided into a first area arranged to convert the light emitted from the light source into the first pattern and a second area arranged to convert the light emitted from the light source into the second pattern, wherein a first plurality of first convex cells, wherein the first plurality extends in a direction orthogonal to the first direction, are formed in parallel in the first area and a second plurality of second convex cells, wherein the second plurality extends in a direction orthogonal to the second direction, are formed in parallel in the second area.