A threaded joint for steel pipes, comprising a tubular pin and a tubular box, the pin and the box being made up by screwing the pin onto the box, the pin including a shoulder surface, a seal surface, and a male threaded portion; the box including a shoulder surface, a seal surface, and a female threaded portion, corresponding to the shoulder surface of the pin, the seal surface thereof, and the male threaded portion thereof, respectively; the male threaded portion and the female threaded portion each being a tapered threaded portion, wherein: the male threaded portion has a thread width that gradually decreases along a thread helix thereof and a groove width that gradually increases along the thread helix, in a direction in which the male threaded portion is screwed; and the female threaded portion has a groove width that gradually decreases along a thread helix thereof and a thread width that gradually increases along the thread helix, in the direction in which the male threaded portion is screwed, in a made-up state, the seal surfaces (22, 56) are in contact with each other, load flanks of the male threaded portion are in contact with load flanks of the female threaded portion, stabbing flanks of the male threaded portion are in contact with stabbing flanks of the female threaded portion, roots of the male threaded portion are in contact with crests of the female threaded portion, and clearances are provided between crests of the male threaded portion and roots of the female threaded portion, and characterised in that: the male threaded portion and the female threaded portion each include threads having a trapezoidal profile, each thread of the male threaded portion and the female threaded portion having a profile width that is larger at a base side than at a crest side, in a made-up state, the shoulder surfaces (24, 59) are in contact with each other, and the shoulder surfaces (24, 59) are configured so that, in the make-up of the threaded joint, a state in which the load flanks (34, 55) contact each other and the stabbing flanks (33, 54) also contact each other occurs when an amount of screwing rotation of the pin with respect to the box is within a range of ±0.150 turns, based on a time at which the shoulder surfaces (24, 59) are brought into contact with each other. the male threaded portion has a thread width that gradually decreases along a thread helix thereof and a groove width that gradually increases along the thread helix, in a direction in which the male threaded portion is screwed; and the female threaded portion has a groove width that gradually decreases along a thread helix thereof and a thread width that gradually increases along the thread helix, in the direction in which the male threaded portion is screwed, in a made-up state, the seal surfaces (22, 56) are in contact with each other, load flanks of the male threaded portion are in contact with load flanks of the female threaded portion, stabbing flanks of the male threaded portion are in contact with stabbing flanks of the female threaded portion, roots of the male threaded portion are in contact with crests of the female threaded portion, and clearances are provided between crests of the male threaded portion and roots of the female threaded portion, and characterised in that: the male threaded portion and the female threaded portion each include threads having a trapezoidal profile, each thread of the male threaded portion and the female threaded portion having a profile width that is larger at a base side than at a crest side, in a made-up state, the shoulder surfaces (24, 59) are in contact with each other, and the shoulder surfaces (24, 59) are configured so that, in the make-up of the threaded joint, a state in which the load flanks (34, 55) contact each other and the stabbing flanks (33, 54) also contact each other occurs when an amount of screwing rotation of the pin with respect to the box is within a range of ±0.150 turns, based on a time at which the shoulder surfaces (24, 59) are brought into contact with each other. the male threaded portion and the female threaded portion each include threads having a trapezoidal profile, each thread of the male threaded portion and the female threaded portion having a profile width that is larger at a base side than at a crest side, in a made-up state, the shoulder surfaces (24, 59) are in contact with each other, and the shoulder surfaces (24, 59) are configured so that, in the make-up of the threaded joint, a state in which the load flanks (34, 55) contact each other and the stabbing flanks (33, 54) also contact each other occurs when an amount of screwing rotation of the pin with respect to the box is within a range of ±0.150 turns, based on a time at which the shoulder surfaces (24, 59) are brought into contact with each other.