Lens, lens structure, and light-emitting module

A light-emitting module comprising:

• a lens comprising:
• a first lens portion having a positive refractive power, and
• a second lens portion having a positive refractive power and located outward of an outer edge of the first lens portion in a top view;
• and
• a light source;
• wherein:
• the first lens portion has an optical axis, a first light incident surface, and a first light exit surface located opposite to the first light incident surface;
• the second lens portion has a second light incident surface and a second light exit surface located opposite to the second light incident surface;
• the light source is disposed facing a first surface of the lens, the first surface comprising the first light incident surface and the second light incident surface;
• the second lens portion is disposed in contact with an outer edge of the first lens portion;
• and
• in a cross section including the optical axis, a boundary light beam emitted from a light-emitting point of the light source located immediately below a boundary between the first lens portion and the second lens portion, in a direction along the optical axis, exits the second light exit surface at an angle in a range from 30 degrees to 50 degrees with respect to the optical axis of the first lens portion such that the boundary light beam has an increasing distance from the optical axis, and passes through a peak point where illuminance of irradiation light from the light-emitting point is maximized on an irradiation plane that is orthogonal to the optical axis and located above the lens.