A spinning machine comprising: a spinning device adapted to produce a spun yarn; a draft device adapted to draft a fiber bundle by draft rollers (16, 17, 19, 20) and to supply the drafted fiber bundle to the spinning device; a winding device adapted to wind the spun yarn produced by the spinning device into a package; and a first detecting section adapted to detect a tension of the spun yarn travelling between the spinning device and the winding device, the first detecting section including a yarn guide adapted to make contact with the travelling spun yarn and a detector adapted to output a signal according to a force applied to the yarn guide, wherein the yarn guide has a substantially arcuate cross-sectional contour at a cross section substantially perpendicular to an axial line of the yarn guide at least at a portion making contact with the spun yarn, and is arranged such that the spun yarn makes contact with the yarn guide while being inclined with respect to the axial line, wherein provided that a first direction is a direction substantially parallel to a yarn path of the spun yarn located upstream of the yarn guide, a second direction is a direction substantially parallel to an axial direction of the draft rollers (16, 17, 19, 20), and a third direction is a direction substantially perpendicular to a plane formed by the first direction and the second direction, when viewed in the third direction, the axial line of the yarn guide is arranged inclined with respect to the first direction, characterized in that the first detecting section is arranged rotated around an axis along the third direction from a position perpendicular to the first direction. a spinning device adapted to produce a spun yarn; a draft device adapted to draft a fiber bundle by draft rollers (16, 17, 19, 20) and to supply the drafted fiber bundle to the spinning device; a winding device adapted to wind the spun yarn produced by the spinning device into a package; and a first detecting section adapted to detect a tension of the spun yarn travelling between the spinning device and the winding device, the first detecting section including a yarn guide adapted to make contact with the travelling spun yarn and a detector adapted to output a signal according to a force applied to the yarn guide, wherein the yarn guide has a substantially arcuate cross-sectional contour at a cross section substantially perpendicular to an axial line of the yarn guide at least at a portion making contact with the spun yarn, and is arranged such that the spun yarn makes contact with the yarn guide while being inclined with respect to the axial line, wherein provided that a first direction is a direction substantially parallel to a yarn path of the spun yarn located upstream of the yarn guide, a second direction is a direction substantially parallel to an axial direction of the draft rollers (16, 17, 19, 20), and a third direction is a direction substantially perpendicular to a plane formed by the first direction and the second direction, when viewed in the third direction, the axial line of the yarn guide is arranged inclined with respect to the first direction, characterized in that the first detecting section is arranged rotated around an axis along the third direction from a position perpendicular to the first direction.