Light emitting device and illumination device

A light emitting device comprising:

• a light guide plate with a first main surface on which a plurality of first protrusion parts arranged along a first direction and extending along a second direction which crosses the first direction;
• a plurality of light source elements disposed on a side surface of the light guide plate to be adjacent to each other;
• and
• a prism sheet disposed to be opposed to the first main surface, wherein
• an emission surface of the light source element is disposed in the second direction,
• a cross-sectional shape of each of the first protrusion parts along the first direction has an apex angle between 55 and 65 degrees, inclusive,
• the light guide plate includes a plurality of second protrusion parts on a second main surface, which extend along the first direction and are arranged along the second direction,
• the plurality of protrusion parts are long in the first direction and short in the second direction,
• the plurality of protrusion parts have a cross-sectional shape along the second direction as an isosceles triangle in which an apex angle is positioned below a base,
• the second protrusion part has a cross-sectional shape along the first direction as a rectangle, and
• a cross-sectional shape of each of the second protrusion parts along the second direction has a base angle between 1 degree and 3 degrees, inclusive.