Portable terminal device having sound emission hole which changes orientation based on rotation of casing about biaxial hinge

A portable terminal device comprising:

• a first casing;
• a second casing;
• a biaxial hinge mutually coupling the first and second casings, axially supporting the first and second casings about a first axis so that the first and second casings can open and close relative to each other, and axially supporting the second casing so the second casing can turn with respect to the first casing about a second axis which crosses the first axis;
• a speaker provided in the first casing;
• a sound emission hole from which sound waves generated from the speaker are emitted;
• a waveguide guiding the sound waves generated from the speaker to the sound emission hole;
• and
• a display device provided for the second casing,
• wherein each of a display screen of the display device and the sound emission hole is disposed in a face whose orientation changes when the second casing turns about the second axis, in the second casing,
• wherein the waveguide comprises:
• an in-hinge waveguide extending in the biaxial hinge,
• a fist sound communication hole which is formed in the first casing and communicates with the in-hinge waveguide,
• a second sound communication hole which is formed in the second casing and communicates with the in-hinge waveguide, and
• an inner waveguide which communicates with the second sound communication hole and extends in the second casing,
• wherein the in-hinge waveguide and the first sound communication hole are positioned coaxially with the second axis.