A scroll fluid machine comprising: a first scroll member including a first end plate and a first wall provided on the first end plate, the first wall having a spiral shape; and a second scroll member including a second end plate that is disposed to face the first end plate, and a second wall provided on the second end plate, the second scroll member being configured to relatively rotate in orbital motion with the second wall engaged with the first wall, the second wall having a spiral shape, characterized in that an inclined portion in which a distance between opposing surfaces of the first end plate and the second end plate facing each other gradually decreases from an outer peripheral side toward an inner peripheral side of the first wall and the second wall is provided, and the inclined portion includes a wall inclined portion (5b1, 3b1) provided on the first wall and the second wall and an end plate inclined portion (3a1, 5a1) provided on the first end plate and the second end plate; the scroll fluid machine further comprises a wall flat portion (3b2, 3b3, 5b2, 5b3) whose height does not vary, the wall flat portion (3b2, 3b3, 5b2, 5b3) being connected to the wall inclined portion and being provided in an outermost peripheral portion and an innermost peripheral portion of the first wall and the second wall; and an end plate flat portion (3a2, 3a3, 5a2, 5a3) which corresponds to the wall flat portion, the end plate flat portion (3a2, 3a3, 5a2, 5a3) being connected to the end plate inclined portion and being provided in the first end plate and the second end plate, in the inclined portion, a tip clearance between a tooth crest of the walls (3b,5b) and a tooth base of the end plates (3a, 5a) facing the tooth crest is greater on the inner peripheral side than on the outer peripheral side at normal temperature, and a flat portion tip clearance between the wall flat portion (3b2, 3b3) of the first wall and the end plate flat portion (5a2, 5a3) of the second end plate is constant in a spiral direction of the first wall, and a flat portion tip clearance between the wall flat portion (5b2, 5b3) of the second wall and the end plate flat portion (3a2, 3a3) of the first end plate is constant in a spiral direction of the second wall. a first scroll member including a first end plate and a first wall provided on the first end plate, the first wall having a spiral shape; and a second scroll member including a second end plate that is disposed to face the first end plate, and a second wall provided on the second end plate, the second scroll member being configured to relatively rotate in orbital motion with the second wall engaged with the first wall, the second wall having a spiral shape, characterized in that an inclined portion in which a distance between opposing surfaces of the first end plate and the second end plate facing each other gradually decreases from an outer peripheral side toward an inner peripheral side of the first wall and the second wall is provided, and the inclined portion includes a wall inclined portion (5b1, 3b1) provided on the first wall and the second wall and an end plate inclined portion (3a1, 5a1) provided on the first end plate and the second end plate; the scroll fluid machine further comprises a wall flat portion (3b2, 3b3, 5b2, 5b3) whose height does not vary, the wall flat portion (3b2, 3b3, 5b2, 5b3) being connected to the wall inclined portion and being provided in an outermost peripheral portion and an innermost peripheral portion of the first wall and the second wall; and an end plate flat portion (3a2, 3a3, 5a2, 5a3) which corresponds to the wall flat portion, the end plate flat portion (3a2, 3a3, 5a2, 5a3) being connected to the end plate inclined portion and being provided in the first end plate and the second end plate, in the inclined portion, a tip clearance between a tooth crest of the walls (3b,5b) and a tooth base of the end plates (3a, 5a) facing the tooth crest is greater on the inner peripheral side than on the outer peripheral side at normal temperature, and a flat portion tip clearance between the wall flat portion (3b2, 3b3) of the first wall and the end plate flat portion (5a2, 5a3) of the second end plate is constant in a spiral direction of the first wall, and a flat portion tip clearance between the wall flat portion (5b2, 5b3) of the second wall and the end plate flat portion (3a2, 3a3) of the first end plate is constant in a spiral direction of the second wall.