A lens structure for a vehicular lamp includes an incident portion surrounding a central axis. The incident portion includes a first inner annular face, a first outer annular face, and an incident face behind the first inner annular face and the first outer annular face. A rear end of a light mixing portion located in front of the incident portion is connected to a front end of the incident portion. The light mixing portion further includes a first reflective face on an inner side thereof and a second reflective face on an outer side thereof. The second reflective face has continuous toothed faces. A light output portion is located in front of the light mixing portion. A rear end of the light output portion is connected to a front end of the light mixing portion. The front end of the light output portion includes a light output face.