Lighting and/or signaling device, notably for a motor vehicle

A lighting and/or signaling device, notably for a motor vehicle, comprising at least one light source and one light guide, said at least one light source comprising a support and a plurality of light emitting components arranged on said support so as to emit a beam of light, said device being configured to direct said beam toward said light guide, in which device said support is a printed circuit and/or said light emitting components are light emitting diodes, in which device said light emitting components are arranged in such a way as to define an emission surface for said beam of light on a face of said support, in which device said at least one light source is configured so that said emission surface has a longitudinally extending axis, in which device said light guide comprises at least one emitting portion configured to emit light out of said light guide, and at least one guide portion, situated between said at least one light source and said at least one light emitting portion, configured to transmit said beam of light from said at least one light source to said at least one emitting portion,

• wherein said at least one light guide portion has a cross section that is smaller than that of said at least one emitting portion.