Inkjet printer and ink dryer

An inkjet printer comprising:

• an inkjet head configured to eject ink onto a surface of a medium;
• a plurality of guide walls each arranged substantially in parallel with a feeding direction of the medium to provide a clearance between the plurality of guide walls;
• an electromagnetic-wave supplier configured to generate an electromagnetic wave;
• a wave guide having a first internal space connected to the clearance and the electromagnetic-wave supplier and configured to apply the electromagnetic wave to the medium which is introduced into the first internal space;
• and
• a plurality of choke portions each comprising a second internal space adjacent to each of the plurality of guide walls and an opening extending from the second internal space to the clearance, the second internal space being connected to the first internal space via the clearance, the second internal space having a length of λ/4 relative to wavelength λ of the electromagnetic wave in the feeding direction,
• wherein said plurality of guide walls have slits which extend along the feeding direction from a periphery of each opening of the plurality of choke portions.