A magnetic type rotation transmitting mechanism (1; 21; 31; 41; 51; 61) comprising: a disc-shaped or toroidal-shaped rotating plate (2; 22; 32; 42; 52; 62) made of a magnetic material; and a magnet (3; 23; 33; 43; 53; 63) to which rotational movement of the rotating plate (2; 22; 32; 42; 52; 62) is transmitted through a magnetic coupling between the magnet (3; 23; 33; 43; 53; 63) and the rotating plate (2; 22; 32; 42; 52; 62), wherein the rotating plate has an outer peripheral edge part, the outer peripheral edge part being provided with a plurality of oblique edge portions (4, 4; 24, 24; 34, 34; 44 to 44; 54, 54; 64, 64) separated at equiangular intervals in the circumferential direction; the magnet (3; 23; 33; 43; 53; 63) is located at a position in an area (6; 26; 36; 46; 56; 66) including a passage route along which the oblique edge portion (4, 4; 24, 24; 34, 34; 44 to 44; 54, 54; 64, 64) moves in accordance with rotation of the rotating plate (2; 22; 32; 42; 52; 62), the position being at which the magnet (3; 23; 33; 43; 53; 63) faces the oblique edge portion (4, 4; 24, 24; 34, 34; 44 to 44; 54, 54; 64, 64) with a prescribed gap; the magnet (3; 23; 33; 43; 53; 63) is either formed with a plurality of magnetic poles along a circumferential direction about the center axis line (3a; 23a; 33a; 43a; 53a; 63a) thereof or formed with a plurality of magnetic poles along the direction of the center axis line (3a; 23a; 33a; 43a; 53a; 63a) thereof; and the oblique edge portion (4, 4; 24, 24; 34, 34; 44 to 44; 54, 54; 64, 64) is inclined from a first end (4a; 24a; 34a; 44a; 54a; 64a) to a second end (4c; 24c; 34c; 44c; 54c; 64c) thereof in the circumferential direction with respect to a direction of a rotation centerline (2a; 22a; 32a; 42a; 52a; 62a) of the rotating plate (2; 22; 32; 42; 52; 62); wherein an orthogonal plane (5; 25; 35; 45; 55; 65) is a plane which is orthogonal to the rotation centerline (2a; 22a; 32a; 42a; 52a; 62a) and which passes through a center (4b; 24b; 34b; 44b; 54b; 64b) between the first and second ends (4a, 4c; 24a, 24c; 34a, 34c; 44a, 44c; 54a, 54c; 64a, 64c) of the oblique edge portion (4, 4; 24, 24; 34, 34; 44 to 44; 54, 54; 64, 64) when viewed along a direction of the rotation centerline (2a; 22a; 32a; 42a; 52a; 62a); the magnet (3; 23; 33; 43; 53; 63) is disposed to rotate about the center axis line (3a; 33a; 33a; 43a; 53a; 63a) located on the orthogonal plane (5; 25; 35; 45; 55; 65), the center axis line extends in the tangential direction of the outer peripheral surface of the oblique edge portion; and the first end of the oblique edge portion is located on one side of the orthogonal plane and is apart from the orthogonal plane toward the one side thereof by a fixed distance, the second end of the oblique edge portion is located on the other side of the orthogonal plane and is apart from the orthogonal plane toward the other side thereof by the same distance, and the midpoint between the first and second ends (4a, 4c) is located on the orthogonal plane. a disc-shaped or toroidal-shaped rotating plate (2; 22; 32; 42; 52; 62) made of a magnetic material; and a magnet (3; 23; 33; 43; 53; 63) to which rotational movement of the rotating plate (2; 22; 32; 42; 52; 62) is transmitted through a magnetic coupling between the magnet (3; 23; 33; 43; 53; 63) and the rotating plate (2; 22; 32; 42; 52; 62), wherein the rotating plate has an outer peripheral edge part, the outer peripheral edge part being provided with a plurality of oblique edge portions (4, 4; 24, 24; 34, 34; 44 to 44; 54, 54; 64, 64) separated at equiangular intervals in the circumferential direction; the magnet (3; 23; 33; 43; 53; 63) is located at a position in an area (6; 26; 36; 46; 56; 66) including a passage route along which the oblique edge portion (4, 4; 24, 24; 34, 34; 44 to 44; 54, 54; 64, 64) moves in accordance with rotation of the rotating plate (2; 22; 32; 42; 52; 62), the position being at which the magnet (3; 23; 33; 43; 53; 63) faces the oblique edge portion (4, 4; 24, 24; 34, 34; 44 to 44; 54, 54; 64, 64) with a prescribed gap; the oblique edge portion (4, 4; 24, 24; 34, 34; 44 to 44; 54, 54; 64, 64) is inclined from a first end (4a; 24a; 34a; 44a; 54a; 64a) to a second end (4c; 24c; 34c; 44c; 54c; 64c) thereof in the circumferential direction with respect to a direction of a rotation centerline (2a; 22a; 32a; 42a; 52a; 62a) of the rotating plate (2; 22; 32; 42; 52; 62); wherein an orthogonal plane (5; 25; 35; 45; 55; 65) is a plane which is orthogonal to the rotation centerline (2a; 22a; 32a; 42a; 52a; 62a) and which passes through a center (4b; 24b; 34b; 44b; 54b; 64b) between the first and second ends (4a, 4c; 24a, 24c; 34a, 34c; 44a, 44c; 54a, 54c; 64a, 64c) of the oblique edge portion (4, 4; 24, 24; 34, 34; 44 to 44; 54, 54; 64, 64) when viewed along a direction of the rotation centerline (2a; 22a; 32a; 42a; 52a; 62a); the magnet (3; 23; 33; 43; 53; 63) is disposed to rotate about the center axis line (3a; 33a; 33a; 43a; 53a; 63a) located on the orthogonal plane (5; 25; 35; 45; 55; 65), the center axis line extends in the tangential direction of the outer peripheral surface of the oblique edge portion; and