<?xml version="1.0"?>
<ownershipDocument>

    <schemaVersion>X0201</schemaVersion>

    <documentType>4</documentType>

    <periodOfReport>2004-02-23</periodOfReport>

    <notSubjectToSection16>0</notSubjectToSection16>

    <issuer>
        <issuerCik>0001051717</issuerCik>
        <issuerName>AMERUS GROUP CO/IA</issuerName>
        <issuerTradingSymbol>AMH</issuerTradingSymbol>
    </issuer>

    <reportingOwner>
        <reportingOwnerId>
            <rptOwnerCik>0001269849</rptOwnerCik>
            <rptOwnerName>BOAL GREGORY D</rptOwnerName>
        </reportingOwnerId>
        <reportingOwnerAddress>
            <rptOwnerStreet1>699 WALNUT STREET</rptOwnerStreet1>
            <rptOwnerStreet2>3RD FLOOR</rptOwnerStreet2>
            <rptOwnerCity>DES MOINES</rptOwnerCity>
            <rptOwnerState>IA</rptOwnerState>
            <rptOwnerZipCode>50309</rptOwnerZipCode>
            <rptOwnerStateDescription></rptOwnerStateDescription>
        </reportingOwnerAddress>
        <reportingOwnerRelationship>
            <isDirector>0</isDirector>
            <isOfficer>1</isOfficer>
            <isTenPercentOwner>0</isTenPercentOwner>
            <isOther>0</isOther>
            <officerTitle>EVP &amp; Chief Investment Officer</officerTitle>
        </reportingOwnerRelationship>
    </reportingOwner>

    <derivativeTable>
        <derivativeTransaction>
            <securityTitle>
                <value>Performance Rights</value>
            </securityTitle>
            <conversionOrExercisePrice>
                <value>37.1600</value>
            </conversionOrExercisePrice>
            <transactionDate>
                <value>2004-02-23</value>
            </transactionDate>
            <deemedExecutionDate>
                <value>2004-02-23</value>
            </deemedExecutionDate>
            <transactionCoding>
                <transactionFormType>4</transactionFormType>
                <transactionCode>A</transactionCode>
                <equitySwapInvolved>0</equitySwapInvolved>
            </transactionCoding>
            <transactionTimeliness>
                <value></value>
            </transactionTimeliness>
            <transactionAmounts>
                <transactionShares>
                    <value>874.6000</value>
                    <footnoteId id="F1"/>
                </transactionShares>
                <transactionPricePerShare>
                    <footnoteId id="F3"/>
                </transactionPricePerShare>
                <transactionAcquiredDisposedCode>
                    <value>A</value>
                </transactionAcquiredDisposedCode>
            </transactionAmounts>
            <exerciseDate>
                <footnoteId id="F2"/>
            </exerciseDate>
            <expirationDate>
                <footnoteId id="F2"/>
            </expirationDate>
            <underlyingSecurity>
                <underlyingSecurityTitle>
                    <value>Common Stock</value>
                </underlyingSecurityTitle>
                <underlyingSecurityShares>
                    <value>874.6000</value>
                </underlyingSecurityShares>
            </underlyingSecurity>
            <postTransactionAmounts>
                <sharesOwnedFollowingTransaction>
                    <value>874.6000</value>
                </sharesOwnedFollowingTransaction>
            </postTransactionAmounts>
            <ownershipNature>
                <directOrIndirectOwnership>
                    <value>D</value>
                </directOrIndirectOwnership>
            </ownershipNature>
        </derivativeTransaction>
    </derivativeTable>

    <footnotes>
        <footnote id="F1">The Company's Senior Executive Incentive Plan (SEIP), an employee plan exempt under Section 16b-3, provides that employees participating in the plan are eligible to defer a portion of their annual bonus to purchase phantom stock units at a price per unit equal to the fair market value (FMV) of the Company's common stock on the date of purchase.  The company will match a specified percentage of the phantom stock units purchased pursuant to the deferral program.  Upon vesting, the Company either will pay to the employee an amount in cash determined by multiplying the number of units times the FMV of the Company's common stock on that date or issue the underlying common stock.</footnote>
        <footnote id="F2">On the third anniversary of the employee's deferral, the Company either will pay to the employee an amount in cash determined by multiplying the number of units times the FMV of the Company's common stock on that date or issue the underlying common stock.  Alternatively, on the third anniversary of the employee's deferral, the employee may elect to redefer the bonus units for another three year period and every three years thereafter, until the earlier of normal retirement or termination.  The entire Company match is forfeited if the employee's employment terminates prior to the third anniversary of the employee's deferral.</footnote>
        <footnote id="F3">Price not applicable.</footnote>
    </footnotes>

    <remarks></remarks>

    <ownerSignature>
        <signatureName>/s/ Jeananne M. Celander, attorney-in-fact for Mr. Boal</signatureName>
        <signatureDate>2004-02-23</signatureDate>
    </ownerSignature>
</ownershipDocument>

