Provided are an optical device, optically assisted magnetic recording head and optically assisted magnetic recording apparatus that effectively emit the introduced light, from the apex portion of a waveguide. The optical device includes: an optical element having a substantially parabolic outline which contains a side surface and the apex portion with a light-emitting surface; a light guiding unit for forming a light spot on the core layer; and a light introducing section provided on the core layer at the position at which the light spot is formed. The light introduced into the core layer travels substantially parallel to the axis of the parabola, and is reflected by the side surface so as to be converged at the focal point of the parabola and is then emitted from the apex portion. The position of the point where the light intensity is greatest in the light spot is deviated from the axis.