Disclosed is a multiband planar antenna including: an insulating film, a first antenna section and a second antenna section facing to the first antenna section across a feeding point on a film, wherein the first antenna section includes: a first antenna element including a side having a length in an extending direction corresponds to a first resonance frequency; a shorter second antenna element at a predetermined distance from and in parallel with the first antenna element; and a first coupling section to couple the first and second antenna elements, wherein a length in the extending direction of a first clearance corresponds to a resonance frequency higher than the first resonance frequency, and wherein the second antenna section includes: third and fourth antenna elements; a second coupling section; and a second clearance similar to the above.