A loudspeaker comprising: a frame having a hollow; a diaphragm located in the hollow of the frame and having: a first surface which is a surface of a recess defined by a thin part and a thick part formed around the thin part; and a second surface opposite to the first side; a first edge connecting an outer peripheral end of the diaphragm and the frame; a second edge connecting the outer peripheral end of the diaphragm and the frame, the second edge being opposite to the first edge in a thickness direction of the thick part; a voice coil body including: a cylindrical bobbin having a first end connected to the thin part on the first surface of the diaphragm and a second end opposite to the first end; and a voice coil wound around at least part of the bobbin; and a magnetic circuit including: an inner part; and an outer part formed around the inner part with a magnetic gap therebetween, wherein part of the magnetic circuit including a first side of the inner part is located from the second end of the bobbin into the bobbin, and the first side of the inner part and a first side of the outer part are located in the recess so that the voice coil is located in the magnetic gap, wherein the diaphragm has an inclined surface such that the diaphragm gradually increases in thickness from the thin part toward the thick part, the outer part of the magnetic circuit has a tapered part tapering toward the diaphragm, and the tapered part being located facing the inclined surface. a frame having a hollow; a diaphragm located in the hollow of the frame and having: a first surface which is a surface of a recess defined by a thin part and a thick part formed around the thin part; and a second surface opposite to the first side; a first surface which is a surface of a recess defined by a thin part and a thick part formed around the thin part; and a second surface opposite to the first side; a first edge connecting an outer peripheral end of the diaphragm and the frame; a second edge connecting the outer peripheral end of the diaphragm and the frame, the second edge being opposite to the first edge in a thickness direction of the thick part; a voice coil body including: a cylindrical bobbin having a first end connected to the thin part on the first surface of the diaphragm and a second end opposite to the first end; and a voice coil wound around at least part of the bobbin; and a cylindrical bobbin having a first end connected to the thin part on the first surface of the diaphragm and a second end opposite to the first end; and a voice coil wound around at least part of the bobbin; and a magnetic circuit including: an inner part; and an outer part formed around the inner part with a magnetic gap therebetween, wherein part of the magnetic circuit including a first side of the inner part is located from the second end of the bobbin into the bobbin, and the first side of the inner part and a first side of the outer part are located in the recess so that the voice coil is located in the magnetic gap, an inner part; and an outer part formed around the inner part with a magnetic gap therebetween, wherein part of the magnetic circuit including a first side of the inner part is located from the second end of the bobbin into the bobbin, and the first side of the inner part and a first side of the outer part are located in the recess so that the voice coil is located in the magnetic gap, wherein the diaphragm has an inclined surface such that the diaphragm gradually increases in thickness from the thin part toward the thick part, the outer part of the magnetic circuit has a tapered part tapering toward the diaphragm, and the tapered part being located facing the inclined surface.