An antibacterial fiber that exhibits predetermined antibacterial properties even when washed repeatedly for 50 or more times, and a method for producing an antibacterial fiber are provided. Disclosed are an antibacterial fiber containing a thermoplastic resin and antibacterial glass particles, and a method for producing the antibacterial fiber, the antibacterial fiber having cracks extending along the length direction of the antibacterial fiber on the surface of the antibacterial fiber, each of the cracks being in a state of having at least one of the antibacterial glass particles sandwiched therein.本發明提供即便反復洗滌50次以上還發揮規定的抗菌性的抗菌性纖維以及抗菌性纖維的製造方法。一種抗菌性纖維及其製造方法，包含熱塑性樹脂和抗菌性玻璃粒子，其特徵在於：在抗菌性纖維的表面具有沿著該抗菌性纖維的長度方向的裂紋，該裂紋為夾持有至少一個上述抗菌性玻璃粒子的狀態。
