Black toner with defined loss tangent

A black toner comprising toner particles containing at least a binder resin, carbon black and a releasing agent, wherein:

• the toner particle has weight-average particle diameter of 3.5 to 8.0 μm;
• total value of acid value and hydroxyl value of the toner is 30 to 75 mgKOH/g;
• average circularity of particles contained in the toner having circle-equivalent diameter of 2 μm or more is 0.915 to 0.960;
• loss tangent tan δ (103 to 104 Hz) of the toner is represented by the following expression:
• tan δ(103 to 104 Hz)≦0.0060
• where the loss tangent tan δ is represented by ∈″/∈′ where ∈″ denotes dielectric loss factor and ∈′ denotes dielectric constant, and tan δ (103 to 104 Hz) denotes the loss tangent in a frequency range of 103 to 104 Hz;
• a ratio of tan δ (105 Hz) to tan δ (5×104 Hz) is represented by the following expression:
• 1.05≦tan δ(105 Hz)/tan δ(5×104 Hz)≦1.40
• where tan δ (105 Hz) denotes loss tangent at the frequency of 105 Hz and tan δ (5×104 Hz) denotes loss tangent at the frequency of 5×104 Hz;
• and
• wherein the toner has molecular weight distribution whose main peak is in a range of 3,000 to 40,000 in gel permeation chromatography (GPC) of tetrahydrofuran (THF) extraction, and has Mw/Mn of 70 or more where Mw denotes weight-average molecular weight and Mn denotes number-average molecular weight.