Speaker

A speaker comprising:

• a diaphragm having a dome shape curved forward in a protruding manner;
• a tubular member having the diaphragm disposed inside, the tubular member having an inner diameter increasing toward a front;
• and
• a phase plug disposed in front of a front surface of the diaphragm,
• wherein the phase plug includes:
• a front surface facing forward,
• a rear surface facing a central portion on a front surface of the diaphragm at a constant interval in parallel, and
• a side surface connecting the front surface and the rear surface,
• wherein the front surface of the phase plug is larger than a rear surface of the phase plug as viewed in a front-rear direction of a speaker, and
• wherein at least the part of a side surface of the phase plug has an inclined surface that extends outward while extending forward, faces an inner circumferential surface of the tubular member and a front surface of the diaphragm, and directs a sound wave generated from the diaphragm toward an inner circumferential surface of the tubular member.