Coil unit and photographing optical device

A coil unit comprising:

• an even number of coils;
• and
• a coil holding member structured to hold the even number of the coils, an outer peripheral face of the coil holding member comprising two or more side-face pairs, each of the side-face pairs comprising a pair of side faces parallel to each other;
• wherein each side face comprises a protruded part around which one of the coils is directly wound, the protruded part being protruded to an outer side of the coil holding member;
• wherein each side face comprises an abutting face with which one end face of the coil wound around the protruded part is abutted;
• wherein two pieces of the even number of the coils each of which is wound around each of the protruded parts of two side faces structuring the side-face pair is structured by using one conducting wire;
• wherein at least one of the side faces comprises a coil guide part for wiring a crossover wire which serially connects the coil wound around the protruded part of one side face structuring the side-face pair with the coil wound around the protruded part of the other side face structuring the side-face pair, the coil guide part being recessed from the abutting face;
• and
• wherein a recessed amount of the coil guide part recessed from the abutting face is set to be not less than an outer diameter of the conducting wire.