Fixing device having a pressing mechanism that presses first and second rotatable members together

A fixing device comprising:

• a first rotatable member;
• a second rotatable member cooperative with said first rotatable member to form a nip for fixing a toner image on a recording material;
• and
• a pressing mechanism configured to press at least one of said first rotatable member and said second rotatable member toward the other,
• wherein a pressure P1 at a first position, in an upstream side of a center of a recording material feeding direction, and which is a maximum pressure in the nip, an average pressure P0 from the first position to a second position, which is a downstream end of the nip in the recording material feeding direction, a toner melt viscosity M1 at the first position, and a toner melt viscosity M2 at the second position, satisfy:
• 0.3 MPa≤P1≤0.65 MPa,
• 0<P0≤0.25 MPa,
• 1.0×104 Pa≤s≤M1<1.0×105 Pa·s, and
• 0.5×102 Pa·s≤M2≤1.0×103 Pa·s.