(57) An exhaust gas purification filter includes a cell assembly (2), seal members (11),
and a skin member (12). The cell assembly (2) having an outer surface and including:
a plurality of cells (21) each disposed to extend in an axial direction (Y) of the
filter, each of the cells having opposing first and second ends (211, 222) in the
axial direction, and a partition wall (22) configured to have a porous structure and
define the plurality of cells partitioned from each other in a grid pattern. The skin
member (12) is configured to have a tubular shape and be mounted on the outer surface
of the cell assembly. The partition wall has a porosity of 50% to 70%. The skin member
has a thickness (T) of 0.3mm to 1.0 mm. The partition wall includes a plurality of
crossing portions (225), each of the cells (21) has at least one part of an outer
periphery (213) defined by a corresponding one of the crossing portions, the at least
one part of the outer periphery of each of the cells is rounded to have a value of
radius of curvature (R) being 0.02mm to 0.6 mm. A degree of distortion (δ), which
is a degree of change in the external dimensions of the exhaust gas purification filter
in the axial direction, is greater than 0 and is 1.5 mm or less. A value of a structural
variable (X), expressed by Equation 1 below, is 0.05 to 6, X = T × R / δ ... Equation
1.
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