Abstract: The present invention provides an LED bulb, which includes a light source portion including at least one LED chip); a housing including a bottom portion supporting the light source portion and a sidewall portion surrounding the light source portion, and opening at one side of a first direction; a base disposed on the other side of the first direction relative to the housing; and a light guide body disposed in a space surrounded by the sidewall portion, and including an incident surface facing the light source portion, a light-emitting surface for making the light from the incident surface emit toward the one side of the first direction, and a peripheral side surface located between the incident surface and the light-emitting surface, wherein the cross-sectional area of the peripheral side surface becomes increasingly larger from a side of the incident surface toward a side of the light-emitting surface.

Abstract: The present invention provides an LED bulb, which includes a light source portion including at least one LED chip); a housing including a bottom portion supporting the light source portion and a sidewall portion surrounding the light source portion, and opening at one side of a first direction; a base disposed on the other side of the first direction relative to the housing; and a light guide body disposed in a space surrounded by the sidewall portion, and including an incident surface facing the light source portion, a light-emitting surface for making the light from the incident surface emit toward the one side of the first direction, and a peripheral side surface located between the incident surface and the light-emitting surface, wherein the cross-sectional area of the peripheral side surface becomes increasingly larger from a side of the incident surface toward a side of the light-emitting surface.