diff --git a/bin/csv-filter b/bin/csv-filter
index f0e86137..8eddc538 100755
--- a/bin/csv-filter
+++ b/bin/csv-filter
@@ -27,6 +27,11 @@ parser.on('--input-row-sep=SEPARATOR',
   options[:input_row_sep] = value
 end
 
+parser.on('--output-col-sep=SEPARATOR',
+          'Output column separator string.') do |value|
+  options[:output_col_sep] = value
+end
+
 parser.on('--output-row-sep=SEPARATOR',
           'Output row separator string.') do |value|
   options[:output_row_sep] = value
diff --git a/test/csv/test_csv_filter.rb b/test/csv/test_csv_filter.rb
index ad691921..dc9f432a 100644
--- a/test/csv/test_csv_filter.rb
+++ b/test/csv/test_csv_filter.rb
@@ -84,6 +84,12 @@ def test_option_input_row_sep
                  run_csv_filter(csv, "--input-row-sep=:"))
   end
 
+  def test_option_output_col_sep
+    csv = "aaa,bbb,ccc\nddd,eee,fff\n"
+    assert_equal(["aaa:bbb:ccc\nddd:eee:fff\n", ""],
+                 run_csv_filter(csv, "--output-col-sep=:"))
+  end
+
   def test_option_output_row_sep
     csv = "aaa,bbb,ccc\nddd,eee,fff\n"
     assert_equal(["aaa,bbb,ccc:ddd,eee,fff:", ""],