A copper-based sliding material comprising sintered copper or sintered copper
alloy,
and 0.1 to 5 vol. % hard substance particles harder in hardness than said copper
or copper alloy, said hard substance particles being substantially evenly dispersed
so that, when at least one, randomly selected surface portion or sectional portion
of said sintered copper or sintered copper alloy is partitioned into squares each
having a side of 20 m, at least one particle exists in each of squares not
less than 80% of the whole squares. The copper-based sliding material has good
anti-seizure property and superior resistance to fatigue without containing any lead.
