Ultrahigh molecular weight polyethylene particles characterized by satisfying at least each of the characteristics shown in the following to: the intrinsic viscosity (η) as measured by using a Ubbelohde viscometer and ODCB (ortho-dichlorobenzene) as a solvent at 135°C at an ultrahigh molecular weight polyethylene concentration of 0.005% is at least 15 dL/g (m 3 /kg) and at most 60 dL/g (m 3 /kg), the bulk density as measured by a method in accordance with JIS K 6760 is at least 130 kg/m 3 and at most 700 kg/m 3, the difference between Tm 1 and Tm 2 (i.e. ΔTm = Tm 1 -Tm 2) is at least 11°C and at most 30°C, where Tm 1 is a melting point (Tm 1) in 1st scan measured by a differential scanning calorimeter at the time when the temperature is raised from 0°C to 230°C at a temperature raising rate of 10°C/min (1st scan), and Tm 2 is a melting point (Tm 2) in 2nd scan measured by DSC at the time when, then, after being left to stand for 5 minutes, lowering the temperature to -20°C at a temperature lowering rate of 10°C/min and then being left to stand for 5 minutes, the temperature is again raised from -20°C to 230°C at a temperature raising rate of 10°C/min (2nd scan), the tensile strength at break (MTS (MPa)) at the time when a heat compression molded sheet is melt-drawn at a temperature higher by 20°C than the melting point (Tm 2) in 2nd scan measured by the above, is at least 2 MPa, the molecular weight distribution (Mw/Mn) being measured as indicated in the description under the title "Measurement of weight average molecular weight and number average molecular weight" is larger than 3 and less than 5, the content of titanium is less than 0.2 ppm; the average particle diameter being measured as indicated in the description under the title "Measurement of average particle diameter" is at least 2 μm and at most 500 μm. the intrinsic viscosity (η) as measured by using a Ubbelohde viscometer and ODCB (ortho-dichlorobenzene) as a solvent at 135°C at an ultrahigh molecular weight polyethylene concentration of 0.005% is at least 15 dL/g (m 3 /kg) and at most 60 dL/g (m 3 /kg), the bulk density as measured by a method in accordance with JIS K 6760 is at least 130 kg/m 3 and at most 700 kg/m 3, the difference between Tm 1 and Tm 2 (i.e. ΔTm = Tm 1 -Tm 2) is at least 11°C and at most 30°C, where Tm 1 is a melting point (Tm 1) in 1st scan measured by a differential scanning calorimeter at the time when the temperature is raised from 0°C to 230°C at a temperature raising rate of 10°C/min (1st scan), and Tm 2 is a melting point (Tm 2) in 2nd scan measured by DSC at the time when, then, after being left to stand for 5 minutes, lowering the temperature to -20°C at a temperature lowering rate of 10°C/min and then being left to stand for 5 minutes, the temperature is again raised from -20°C to 230°C at a temperature raising rate of 10°C/min (2nd scan), the tensile strength at break (MTS (MPa)) at the time when a heat compression molded sheet is melt-drawn at a temperature higher by 20°C than the melting point (Tm 2) in 2nd scan measured by the above, is at least 2 MPa, the molecular weight distribution (Mw/Mn) being measured as indicated in the description under the title "Measurement of weight average molecular weight and number average molecular weight" is larger than 3 and less than 5, the content of titanium is less than 0.2 ppm; the average particle diameter being measured as indicated in the description under the title "Measurement of average particle diameter" is at least 2 μm and at most 500 μm.